Question

Need help!!!

1. Solve the equation:
x^2-4x+4=100

A. x= -4; x=10
B. x= -8; x=12
C. x= -5; x=25
D. x= 10; x=10

Answer 1

B.

Explanation:

Move 100 to the left side and subtract from both sides. Then subtract 100 from 4. Factor x^2-4x-96 using the AC method.=0 x^2+bx+c. Find a product that is -96 and a sum -4. This will be -12, 8. The factored form is (x-12)(x+8)=0. Then, solve for x.

(x-12)=0 (x+8)=0. You get x=12, -8.