How do you use substitution to find x=-2 for f(x) = -x^4+8x^3+13x-4?

1 Answer
Jim G.
May 8, 2018

f(-2)=-110

Explanation:

"substitute x = - 2 into "f(x)" and evaluate"

f(color(red)(-2))=-(color(red)(-2))^4+8(color(red)(-2))^3+13(color(red)(-2))-4

color(white)(xxxx)=-16-64-26-4=-110

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