Question

Use the quadratic formula to solve -4x2 + 4x + 80 = 0 pls help

Answer 1

First divide everything by -4

Answer 2

x^2-x-20=0

Answer 3

a=1, b=-1, c=-20

Answer 4

\[x=\frac{1\pm \sqrt{1-4(-20)}}{2}\]

Answer 5

Simplify. You will get 5 and -4

Answer 6

thank you

Answer 7

-4x^2 + 4X + 80 =0
is in the form of Ax^2 + Bx^2+C=0

from the quadratic eq, put a, b and c respectively. Don't forget, we have two x values here, with + and - signs.

Answer 8

ok thank for the help