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Simplify the following expressions by reducing it to a single fraction: 2x-5/4 - 1-x/3 - x-4/2

Mathematics

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Answer

x=6x = 6

Step-by-step solution

5 steps
  1. Tumia sheria ya logariti log⁡a−log⁡b=log⁡(ab)\log a - \log b = \log \left(\frac{a}{b}\right) kurahisisha pande zote mbili za mlinganyo.

    log⁡(2x−112)=log⁡(3x)\log \left(\frac{2x - 11}{2}\right) = \log \left(\frac{3}{x}\right)
  2. Kwa kuwa log⁡A=log⁡B\log A = \log B inamaanisha A=BA = B, linganisha hoja za logariti.

    2x−112=3x\frac{2x - 11}{2} = \frac{3}{x}
  3. Tatua mlinganyo wa aljebra kwa xx.

    Zidisha pande zote mbili kwa 2x2x kuondoa vigawe.

    x(2x−11)=2×3x(2x - 11) = 2 \times 3 2x2−11x=62x^2 - 11x = 6

    Panga upya mlinganyo kuwa fomu ya quadratic ax2+bx+c=0ax^2 + bx + c = 0.

    2x2−11x−6=02x^2 - 11x - 6 = 0
  4. Tatua mlinganyo wa quadratic kwa kutumia njia ya kuzidisha.

    Tafuta namba mbili zinazozidisha hadi 2×(−6)=−122 \times (-6) = -12 na kujumlisha hadi −11-11. Namba hizo ni −12-12 na 1.

    2x2−12x+x−6=02x^2 - 12x + x - 6 = 0

    Toa 2x2x kama kigezo cha kawaida kutoka kwa maneno mawili ya kwanza na 1 kutoka kwa maneno mawili ya mwisho.

    2x(x−6)+1(x−6)=02x(x - 6) + 1(x - 6) = 0

    Toa (x−6)(x - 6) kama kigezo cha kawaida.

    (2x+1)(x−6)=0(2x + 1)(x - 6) = 0

    Hii inatoa suluhisho mbili zinazowezekana:

    2x+1=0  ⟹  2x=−1  ⟹  x=−122x + 1 = 0 \implies 2x = -1 \implies x = -\frac{1}{2} x−6=0  ⟹  x=6x - 6 = 0 \implies x = 6
  5. Angalia uhalali wa suluhisho.

    Hoja ya logariti lazima iwe chanya.
    Kwa x=−12x = -\frac{1}{2}:
    2x−11=2(−12)−11=−1−11=−122x - 11 = 2\left(-\frac{1}{2}\right) - 11 = -1 - 11 = -12. Hii ni hasi, hivyo log⁡(−12)\log(-12) haijafafanuliwa.
    x=−12x = -\frac{1}{2}. Hii ni hasi, hivyo log⁡(−12)\log\left(-\frac{1}{2}\right) haijafafanuliwa.
    Kwa hiyo, x=−12x = -\frac{1}{2} si suluhisho halali.

    Kwa x=6x = 6:
    2x−11=2(6)−11=12−11=12x - 11 = 2(6) - 11 = 12 - 11 = 1. Hii ni chanya.
    x=6x = 6. Hii ni chanya.
    Hoja zote za logariti ni chanya, hivyo x=6x = 6 ni suluhisho halali.

    Thamani ya xx inayokidhi mlinganyo ni:

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