Find the value of the expression 4a^4 − 2b^2 + 40 when a = 2 and b = 7. Can someone Help plss

Question

tanya123 · Answer

Given: 

$\ \sf\color{red}{a \color{black}{=} 2} $
$\ \sf\color{blue}{b \color{black}{=} 7}$ 

Equation: $\ \sf 4\color{red}{a}^4 − 2\color{blue}{b}^2 + 40$

Substitute the values you're given into your equation. Continue to solve.

anonymous · Answer

i already tried to solve this problem many times & i keep getting the same answer that is incorrect.. -.- @tanya123

tanya123 · Answer

$\ 4(\sf\color{red}{2})^2 - 2(\color{blue}{7})^2 + 40 \implies  4(4) - 2(49) + 40 = 16 - 98 + 40 = -42  $

anonymous · Answer

its not one of the answer choices..

tanya123 · Answer

Oh flutter, made a typo. 

4a^4 =/= 4a^2

You get the idea. Try it yourself.

tanya123 · Answer

Overall answer is 6, if you must know.

anonymous · Answer

i kind of get it now.. but thank you :)

tanya123 · Answer

You're welcome.