Question

F(x)=-2x^2+3x-5

Solve for
F(2x)

Answer 1

Do you know how to plug expressions into functions?

Do you know how to solve quadratic equations?

Which part do you need help with?

Answer 2

I did that and got

-6x^2+6x-5

Answer 3

Close, but not quite. \[ -2(2x)^2+3(2x)-5 = -2(2x)(2x) + 6x-5=-8x^2+6x-5\] Now, we can use the quadratic formula to find the roots. \[a=-8,\ b=6,\ c=-5\] Make sense?

Answer 4

Am just not for sure if that is correct

Answer 5

I meant not sure about my work not yours

Answer 6

I don't follow you on the roots part.

Answer 7

Hmmm, you might not need to find the roots. So maybe we are already finished. Disregard what I said.

Answer 8

Oh wait never mind I follow you.

Answer 9

Thank you for your help.