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Mathematics

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7 parts
a(i)

x4−x3+15x+Cx^4 - x^3 + 15x + C

a(ii)

−163-\frac{16}{3}

a(iii)

(x3+1)66+C\frac{(x^3 + 1)^6}{6} + C

a(iv)

400(1−e−t10)400(1 - e^{-\frac{t}{10}})

b(i)

P(x)=−3x2+100x−5000P(x) = -3x^2 + 100x - 5000

b(ii)

-KSh 4,300\text{-KSh 4,300}

c

KSh 400\text{KSh 400}

KSh 600\text{KSh 600}

Step-by-step solution

24 steps

Huu hapa ni utatuzi wa maswali yako:

Part a(i)· 2 steps

∫(4x3−3x2+15)dx\int (4x^3 - 3x^2 + 15)dx

Tathmini viambajengo vifuatavyo

  1. Tumia sheria ya nguvu ya kiambajengo ∫xndx=xn+1n+1+C\int x^n dx = \frac{x^{n+1}}{n+1} + C.

    ∫(4x3−3x2+15)dx=4x3+13+1−3x2+12+1+15x+C\int (4x^3 - 3x^2 + 15)dx = 4\frac{x^{3+1}}{3+1} - 3\frac{x^{2+1}}{2+1} + 15x + C
  2. Rahisisha.

    =4x44−3x33+15x+C= 4\frac{x^4}{4} - 3\frac{x^3}{3} + 15x + C =x4−x3+15x+C= x^4 - x^3 + 15x + C

    Jibu: x4−x3+15x+C\boxed{x^4 - x^3 + 15x + C}

Part a(ii)

−163-\frac{16}{3}

∫02(x2−4x)dx\int_0^2 (x^2 - 4x)dx

  1. Tafuta kiambajengo kisicho na kikomo.

    ∫(x2−4x)dx=x2+12+1−4x1+11+1=x33−4x22=x33−2x2\int (x^2 - 4x)dx = \frac{x^{2+1}}{2+1} - 4\frac{x^{1+1}}{1+1} = \frac{x^3}{3} - 4\frac{x^2}{2} = \frac{x^3}{3} - 2x^2
  2. Tumia mipaka ya kiambajengo (kutoka 0 hadi 2).

    [x33−2x2]02=(233−2(22))−(033−2(02))\left[\frac{x^3}{3} - 2x^2\right]_0^2 = \left(\frac{2^3}{3} - 2(2^2)\right) - \left(\frac{0^3}{3} - 2(0^2)\right) =(83−2(4))−(0−0)= \left(\frac{8}{3} - 2(4)\right) - (0 - 0) =83−8= \frac{8}{3} - 8
  3. Rahisisha.

    =83−243=−163= \frac{8}{3} - \frac{24}{3} = -\frac{16}{3}

    Jibu: −163\boxed{-\frac{16}{3}}

Part a(iii)

(x3+1)66+C\frac{(x^3 + 1)^6}{6} + C

∫3x2(x3+1)5dx\int 3x^2(x^3 + 1)^5 dx

  1. Tumia njia ya ubadilishaji.

    Acha u=x3+1u = x^3 + 1.

  2. Tafuta dudu.

    du=ddx(x3+1)dx=3x2dxdu = \frac{d}{dx}(x^3 + 1) dx = 3x^2 dx
  3. Badilisha uu na dudu kwenye kiambajengo.

    ∫u5du\int u^5 du
  4. Tafuta kiambajengo.

    =u5+15+1+C=u66+C= \frac{u^{5+1}}{5+1} + C = \frac{u^6}{6} + C
  5. Rudisha u=x3+1u = x^3 + 1.

    =(x3+1)66+C= \frac{(x^3 + 1)^6}{6} + C

    Jibu: (x3+1)66+C\boxed{\frac{(x^3 + 1)^6}{6} + C}

Part a(iv)

400(1−e−t10)400(1 - e^{-\frac{t}{10}})

V(t)=∫0tP(τ)dτV(t) = \int_0^t P(\tau) d\tau. Kutokana na P(t)=40e−t10P(t) = 40e^{-\frac{t}{10}}.

  1. Badilisha P(τ)P(\tau) kwenye kiambajengo.

    V(t)=∫0t40e−τ10dτV(t) = \int_0^t 40e^{-\frac{\tau}{10}} d\tau
  2. Tafuta kiambajengo kisicho na kikomo.

    Acha u=−τ10u = -\frac{\tau}{10}, basi du=−110dτdu = -\frac{1}{10} d\tau, hivyo dτ=−10dud\tau = -10 du.

    ∫40eu(−10du)=−400∫eudu=−400eu\int 40e^u (-10 du) = -400 \int e^u du = -400e^u
  3. Rudisha u=−τ10u = -\frac{\tau}{10} na tumia mipaka ya kiambajengo.

    [−400e−τ10]0t=−400e−t10−(−400e−010)\left[-400e^{-\frac{\tau}{10}}\right]_0^t = -400e^{-\frac{t}{10}} - (-400e^{-\frac{0}{10}}) =−400e−t10−(−400e0)= -400e^{-\frac{t}{10}} - (-400e^0) =−400e−t10+400(1)= -400e^{-\frac{t}{10}} + 400(1)
  4. Rahisisha.

    =400−400e−t10=400(1−e−t10)= 400 - 400e^{-\frac{t}{10}} = 400(1 - e^{-\frac{t}{10}})

    Jibu: 400(1−e−t10)\boxed{400(1 - e^{-\frac{t}{10}})}

Part b(i)

P(x)=−3x2+100x−5000P(x) = -3x^2 + 100x - 5000

Bainisha kazi ya faida P(x)P(x).

Kampuni ndogo ya utengenezaji inazalisha na kuuza viti maalum vya ofisi.

  1. Tafuta kazi ya mapato R(x)R(x) kwa kuunganisha MR(x)MR(x).

    R(x)=∫MR(x)dx=∫(120−4x)dx=120x−2x2+CRR(x) = \int MR(x) dx = \int (120 - 4x) dx = 120x - 2x^2 + C_R

    Kwa kuwa mapato ni 0 wakati hakuna viti vinavyouzwa (R(0)=0R(0)=0), CR=0C_R = 0.

    R(x)=120x−2x2R(x) = 120x - 2x^2
  2. Tafuta kazi ya gharama C(x)C(x) kwa kuunganisha MC(x)MC(x).

    C(x)=∫MC(x)dx=∫(20+2x)dx=20x+x2+CCC(x) = \int MC(x) dx = \int (20 + 2x) dx = 20x + x^2 + C_C

    Gharama zisizobadilika ni KSh 5,000, ambayo inamaanisha C(0)=5000C(0) = 5000. Hivyo CC=5000C_C = 5000.

    C(x)=x2+20x+5000C(x) = x^2 + 20x + 5000
  3. Tafuta kazi ya faida P(x)=R(x)−C(x)P(x) = R(x) - C(x).

    P(x)=(120x−2x2)−(x2+20x+5000)P(x) = (120x - 2x^2) - (x^2 + 20x + 5000) P(x)=120x−2x2−x2−20x−5000P(x) = 120x - 2x^2 - x^2 - 20x - 5000
  4. Rahisisha.

    P(x)=−3x2+100x−5000P(x) = -3x^2 + 100x - 5000

    Jibu: P(x)=−3x2+100x−5000\boxed{P(x) = -3x^2 + 100x - 5000}

Part b(ii)

-KSh 4,300\text{-KSh 4,300}

Kokotoa faida wakati viti 10 vinazalishwa na kuuzwa.

  1. Badilisha x=10x = 10 kwenye kazi ya faida P(x)P(x).

    P(10)=−3(10)2+100(10)−5000P(10) = -3(10)^2 + 100(10) - 5000 P(10)=−3(100)+1000−5000P(10) = -3(100) + 1000 - 5000 P(10)=−300+1000−5000P(10) = -300 + 1000 - 5000
  2. Kokotoa thamani.

    P(10)=700−5000=−4300P(10) = 700 - 5000 = -4300

    Jibu: Faida ni -KSh 4,300\boxed{\text{-KSh 4,300}} (hasara ya KSh 4,300).

Part b(iii)

Tafsiri maana ya kiuchumi ya gharama zisizobadilika, kazi ya mapato ya pembezoni, na kazi ya gharama ya pembezoni.

  • Gharama zisizobadilika (Fixed Cost): Hii ni gharama ambayo kampuni inatumia bila kujali idadi ya viti vinavyozalishwa. Inabaki sawa hata kama hakuna viti vinavyozalishwa. Kwa mfano, kodi ya jengo au mishahara ya wafanyakazi wa kudumu.
  • Kazi ya Mapato ya Pembezoni (MR(x)MR(x)): Hii inaonyesha mapato ya ziada yanayopatikana kutokana na kuuza kitengo kimoja cha ziada cha bidhaa (kiti). Inasaidia kampuni kuamua kama kuuza kitengo kingine kutaleta faida.
  • Kazi ya Gharama ya Pembezoni (MC(x)MC(x)): Hii inaonyesha gharama ya ziada inayotumika kuzalisha kitengo kimoja cha ziada cha bidhaa (kiti). Inasaidia kampuni kuamua kama kuzalisha kitengo kingine kuna gharama nafuu.

Part c

KSh 400\text{KSh 400}

Utafiti wa soko kwa bidhaa fulani nchini Kenya ulianzisha kazi zifuatazo za mahitaji na usambazaji

Mahitaji: P=120−2xP = 120 - 2x
Usambazaji: P=3x+20P = 3x + 20

Tafuta ziada ya wazalishaji na watumiaji na utafsiri maana ya kila moja kuhusiana na kufanya maamuzi ya biashara na ufanisi wa soko.

  1. Tafuta bei na wingi wa usawa (xe,Pex_e, P_e).

    Weka kazi za mahitaji na usambazaji sawa.

    120−2x=3x+20120 - 2x = 3x + 20 120−20=3x+2x120 - 20 = 3x + 2x 100=5x100 = 5x xe=1005=20x_e = \frac{100}{5} = 20

    Badilisha xe=20x_e = 20 kwenye mojawapo ya kazi ili kupata PeP_e.

    Pe=120−2(20)=120−40=80P_e = 120 - 2(20) = 120 - 40 = 80

    Hivyo, wingi wa usawa ni xe=20x_e = 20 na bei ya usawa ni Pe=KSh 80P_e = \text{KSh } 80.

  2. Kokotoa Ziada ya Mtumiaji (Consumer Surplus, CS).

    CS=∫0xe(PD(x)−Pe)dxCS = \int_0^{x_e} (P_D(x) - P_e) dx CS=∫020((120−2x)−80)dxCS = \int_0^{20} ((120 - 2x) - 80) dx CS=∫020(40−2x)dxCS = \int_0^{20} (40 - 2x) dx CS=[40x−x2]020CS = \left[40x - x^2\right]_0^{20} CS=(40(20)−(20)2)−(40(0)−(0)2)CS = (40(20) - (20)^2) - (40(0) - (0)^2) CS=(800−400)−0=400CS = (800 - 400) - 0 = 400

    Ziada ya Mtumiaji: KSh 400\boxed{\text{KSh 400}}

  3. Kokotoa Ziada ya Mzalishaji (Producer Surplus, PS).

    PS=∫0xe(Pe−PS(x))dxPS = \int_0^{x_e} (P_e - P_S(x)) dx PS=∫020(80−(3x+20))dxPS = \int_0^{20} (80 - (3x + 20)) dx PS=∫020(80−3x−20)dxPS = \int_0^{20} (80 - 3x - 20) dx PS=∫020(60−3x)dxPS = \int_0^{20} (60 - 3x) dx PS=[60x−32x2]020PS = \left[60x - \frac{3}{2}x^2\right]_0^{20} PS=(60(20)−32(20)2)−(60(0)−32(0)2)PS = \left(60(20) - \frac{3}{2}(20)^2\right) - \left(60(0) - \frac{3}{2}(0)^2\right) PS=(1200−32(400))−0PS = \left(1200 - \frac{3}{2}(400)\right) - 0 PS=1200−3(200)=1200−600=600PS = 1200 - 3(200) = 1200 - 600 = 600

    Ziada ya Mzalishaji: KSh 600\boxed{\text{KSh 600}}

  4. Tafsiri maana ya Ziada ya Mtumiaji na Ziada ya Mzalishaji.

    • Ziada ya Mtumiaji (Consumer Surplus): Hii inawakilisha faida ya kifedha ambayo watumiaji hupata kwa kununua bidhaa kwa bei ya chini kuliko bei ya juu zaidi ambayo wangekuwa tayari kulipa. Katika kesi hii, watumiaji wanapata faida ya KSh 400, ikionyesha thamani ya ziada wanayoipata kutoka sokoni. Kwa maamuzi ya biashara, ziada kubwa ya watumiaji inaweza kuashiria kuwa bidhaa inathaminiwa sana na watumiaji, na kuna uwezekano wa kuongeza bei kidogo bila kupoteza wateja wengi.
    • Ziada ya Mzalishaji (Producer Surplus): Hii inawakilisha faida ya kifedha ambayo wazalishaji hupata kwa kuuza bidhaa kwa bei ya juu kuliko bei ya chini zaidi ambayo wangekuwa tayari kuuza. Katika kesi hii, wazalishaji wanapata faida ya KSh 600, ikionyesha ufanisi wa soko kwa wazalishaji. Kwa maamuzi ya biashara, ziada kubwa ya wazalishaji inaweza kuashiria kuwa uzalishaji una faida na soko linafaa kwa uwekezaji zaidi au upanuzi.

    Ziada zote mbili zinaonyesha ufanisi wa soko. Ziada ya jumla (CS + PS) ni kipimo cha ustawi wa jamii unaotokana na biashara katika soko.

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