How do you use synthetic substitution to find f(3) and f(-2) for $f(x)=x^4-5x+2$ ?

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Answer 1 · 2015-11-02T14:54:27

f(3)= 68; f(-2)= 28

Substitute x by 3 to get f(3) and -2 to get f(-2).

Accordingly, f(3)= $3^4 -5(3) +2=68$

and f(-2)= $(-2)^4 -5(-2) +2 = 28$

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How do you use synthetic substitution to find f(3) and f(-2) for f(x)=x^4-5x+2f(x)=x^4-5x+2?