For the function shown below, find f(3): f(x)=2x^4-8x^2+5x-7

Question

asked Apr 26, 2019 160k views

2 Answers

Skim · Answer 1 · 2019-04-30T17:29:35+0000

We have been given the function

f(x)=2x^4-8x^2+5x-7

We have to find the value of f(3). In order to find the same, substitute x=3 in the given function.

f(3)=2(3)^4-8(3)^2+5(3)-7

Now, we simplify this step by step.

First of all
$3^4=81\text{ and }3^2=9$ . Thus, we have

f(3)=2* 81 -8* 9+5(3)-7

Now, we can easily simplify it by PEMDAS

f(3)=162-72+15-7

f(3)=98

Therefore, the value of f(3) is 98.