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In a polynomial p(x) = 2x3 + 9x2 + kx + 3, p(-2) = p(-3). Find the value of k. |
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Answer» p(x) = 2x3 + 9x2 + kx + 3 p(-2) = 2(-2)3 + 9(-2)2 + k(-2) + 3 = -16 + 36 – 2k + 3 = 23 – 2k p(-3) = 2(-3)3 + 9(-3)2 + k(-3) + 3 = -54 + 81 – 3k + 3 = 30 – 3k We have p(-2) = p(-3), 23 -2k = 30 -3k -2k + 3k = 30 – 23 k = 7 |
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