Question

find the value of p(x) = x4-8x3+11x2-7x-12 at -3 and -1​

Answer 1

Answer:

$x {}^{4} - 8x {}^{3} + 11x {}^{2} - 7x - 12$

When x = - 3

$( - 3) {}^{4} - 8( - 3) {}^{3} + 11( - 3) {}^{2} - 7( - 3) - 12$

$81 - 8( - 27) + 11(9) + 21 - 12$

$81 + 216 + 99 + 21 - 12$

$= 405$

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When x = - 1

$( - 1) {}^{4} - 8( - 1) {}^{3} + 11( - 1) {}^{2} - 7( - 1) - 12$

$1 + 8 + 11 + 7 - 12$

$= 15$

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