Multiple choice. What are the possible values of x in 32x + 20 = 28x − 16x^2?

A.1/32−+4i79−−√32

B.−1/8−+i√ 79/8

C.−1/8−+i7√8

D.1/32−+i7√4

Question

Multiple choice. What are the possible values of x in 32x + 20 = 28x − 16x^2?

A.1/32−+4i79−−√32 




B.−1/8−+i√ 79/8 




C.−1/8−+i7√8 




D.1/32−+i7√4

anonymous · Answer

First step would be to rewrite the original equation with all term on the left with a zero on right, then solve for x using the quadratic equation.

anonymous · Answer

I know I'm just stuck on this, I think it's A??

anonymous · Answer

$$16x ^{2}+4x+20=0$$
Divide both sides by 4
$$4x ^{2}+x+5=0$$
a=4; b=1; c=5 for quadratic equation:
$$x=\frac{ -b \pm \sqrt{b ^{2}-4ac} }{ 2a }$$

anonymous · Answer

Answer will be either b or c by a quick visual inspection

anonymous · Answer

Its B :) thanks