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

1 Answer

Nov 2, 2015

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

Explanation:

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

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

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

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