# Chapter 4 - Section 4.3 - Polynomial Functions, Graphs, and Composition - 4.3 Exercises: 13

a. -11, b. 4, c. -8

#### Work Step by Step

We are given the function $f(x)=-x^{2}+2x^{3}-8$. In order to find the specified values, we can plug the values into the function and solve. a. $f(-1)= -(-1)^{2}+2(-1)^{3}-8=(-1\times1)+(2\times-1)-8=(-1)+(-2)-8=-1-2-8=-11$ b. $f(2)= -(2)^{2}+2(2)^{3}-8=(-1\times4)+(2\times8)-8=(-4)+(16)-8=-4+16-8=4$ c. $f(0)= -(0)^{2}+2(0)^{3}-8=(-1\times0)+(2\times0)-8=(0)+(0)-8=0+0-8=-8$

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