Find the real or imaginary solutions to the given equation by using the quadratic formula

Question

asked Jan 28, 2018 220k views

1 Answer

Kcnygaard · Answer 1 · 2018-02-01T14:03:21+0000

Subtract 8x from both sides to get
x^(2) -8x+20=0

Then using the quadratic formula:
$x= \frac{-b+/- \sqrt{ b^(2)-4ac } }{2a}$
Substitute a = 1, b = -8, and c = 20

x= (8+/- √(64-4(1)(20)) )/(2(1))

-(-8) = 8 and (-8)^2 = 64

x=4+/-2i