Question

Find f(3) if f(x) = x^4 + 2x² - 1

Answer 1

Given

$f(x)=x^4+2x^2-1,$

in order to find f(3) we must replace every x in the function with a 3 and simplify:

$f(3)=(3)^4+2(3)^2-1=81+2(9)-1=80+18=98.$

So f(3)=98.