Question

Given f(x) = 2x4- 3x2 - 8x + 4 , what is f(3)?
A. 88

B. 115

C. 131

D. 133

Answer 1

here, you have to replace \(x=3\), so, we have:
\[\Large f\left( 3 \right) = 2 \cdot \left( {{3^4}} \right) - 3 \cdot \left( {{3^2}} \right) - 8 \cdot 3 + 4 = ...?\]

Answer 2

Yeah.
So do I just solve all of that?

Answer 3

yes!
please keep in mind that:
\(3^4=81\), \(3^2=9\)

Answer 4

...I got 130.

Answer 5

Oh crap nevermind hold on.

Answer 6

115?

Answer 7

correct!

Answer 8

Thank you for your help!

Answer 9

:)

Answer 10

Do you think you could help me on my other problems?

Answer 11

@Michele_Laino