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Draw the graph of y = x3 − 6x2 − x + 3 for the values of x in the range -2 <= x < 4. Use your graph to find the solutions of the equation x3 − 6x2 − x + 3 = 0.

Mathematics

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Answer

x≈−0.7,x≈0.5x \approx -0.7, x \approx 0.5

Graph of y = x³ − 6x² − x + 3

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Key points of y = x³ − 6x² − x + 3
Pointxy
x-intercept−0.750
Maximum−0.083.04
y-intercept03
x-intercept0.660

Step-by-step solution

3 steps

Hili ni swali la kuchora grafu ya mlinganyo wa ujazo na kisha kutumia grafu hiyo kupata suluhisho.

  1. Tengeneza jedwali la thamani za y=x3−6x2−x+3y = x^3 - 6x^2 - x + 3 kwa xx katika kipindi cha −2≤x<4-2 \le x < 4.

    Hii inamaanisha tutatumia thamani za x=−2,−1,0,1,2,3x = -2, -1, 0, 1, 2, 3.

    • Kwa x=−2x = -2: y=(−2)3−6(−2)2−(−2)+3y = (-2)^3 - 6(-2)^2 - (-2) + 3 y=−8−6(4)+2+3y = -8 - 6(4) + 2 + 3 y=−8−24+2+3=−27y = -8 - 24 + 2 + 3 = -27

    • Kwa x=−1x = -1: y=(−1)3−6(−1)2−(−1)+3y = (-1)^3 - 6(-1)^2 - (-1) + 3 y=−1−6(1)+1+3y = -1 - 6(1) + 1 + 3 y=−1−6+1+3=−3y = -1 - 6 + 1 + 3 = -3

    • Kwa x=0x = 0: y=(0)3−6(0)2−(0)+3y = (0)^3 - 6(0)^2 - (0) + 3 y=0−0−0+3=3y = 0 - 0 - 0 + 3 = 3

    • Kwa x=1x = 1: y=(1)3−6(1)2−(1)+3y = (1)^3 - 6(1)^2 - (1) + 3 y=1−6(1)−1+3y = 1 - 6(1) - 1 + 3 y=1−6−1+3=−3y = 1 - 6 - 1 + 3 = -3

    • Kwa x=2x = 2: y=(2)3−6(2)2−(2)+3y = (2)^3 - 6(2)^2 - (2) + 3 y=8−6(4)−2+3y = 8 - 6(4) - 2 + 3 y=8−24−2+3=−15y = 8 - 24 - 2 + 3 = -15

    • Kwa x=3x = 3: y=(3)3−6(3)2−(3)+3y = (3)^3 - 6(3)^2 - (3) + 3 y=27−6(9)−3+3y = 27 - 6(9) - 3 + 3 y=27−54−3+3=−27y = 27 - 54 - 3 + 3 = -27

    Jedwali la thamani ni:

    x−2−10123y−27−33−3−15−27\begin{array}{|c|c|c|c|c|c|c|} \hline x & -2 & -1 & 0 & 1 & 2 & 3 \\ \hline y & -27 & -3 & 3 & -3 & -15 & -27 \\ \hline \end{array}
  2. Chora grafu.

    Panga pointi hizi kwenye ndege ya Cartesian (grafu). Unganisha pointi kwa kutumia mstari laini ili kuunda grafu ya y=x3−6x2−x+3y = x^3 - 6x^2 - x + 3. Hakikisha unatumia mizani inayofaa kwa shoka zote mbili.

  3. Tumia grafu kupata suluhisho za mlinganyo x3−6x2−x+3=0x^3 - 6x^2 - x + 3 = 0.

    Suluhisho za mlinganyo x3−6x2−x+3=0x^3 - 6x^2 - x + 3 = 0 ni sehemu ambapo grafu ya y=x3−6x2−x+3y = x^3 - 6x^2 - x + 3 inakata mhimili wa xx (yaani, ambapo y=0y=0).

    Kutoka kwenye jedwali la thamani:

    • Kuna mabadiliko ya ishara ya yy kutoka x=−1x=-1 (y=−3y=-3) hadi x=0x=0 (y=3y=3). Hii inamaanisha kuna suluhisho moja kati ya x=−1x=-1 na x=0x=0.
    • Kuna mabadiliko ya ishara ya yy kutoka x=0x=0 (y=3y=3) hadi x=1x=1 (y=−3y=-3). Hii inamaanisha kuna suluhisho moja kati ya x=0x=0 na x=1x=1.

    Kwa kusoma kutoka kwenye grafu iliyochorwa kwa usahihi, utapata suluhisho za takriban:

    • Suluhisho la kwanza: x≈−0.7x \approx -0.7
    • Suluhisho la pili: x≈0.5x \approx 0.5

    Kumbuka kuwa mlinganyo wa ujazo unaweza kuwa na suluhisho tatu. Hata hivyo, kwa kuzingatia kipindi cha xx kilichotolewa (−2≤x<4-2 \le x < 4), suluhisho mbili tu ndizo zitakazoonekana wazi kwenye grafu yako. Suluhisho la tatu liko nje ya kipindi hiki.

    Suluhisho za mlinganyo x3−6x2−x+3=0x^3 - 6x^2 - x + 3 = 0 ni takriban:

    x≈−0.7,x≈0.5x \approx -0.7, x \approx 0.5
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