Question

Solve x2 + 12x = –20 by completing the square.

Add (StartFraction b Over 2 EndFraction) squared to both sides of the equation. The value of (StartFraction b Over 2 EndFraction) squared in this equation is
.
Write the left side of the equation as a binomial squared. The left side of the eq
uation becomes (
)2.
Use the square root property of equality.
Isolate the variable: x =

Answer 1

if you meant 2x answer is

`(-10)/(7)`

Explanation:

2x+12x=-20

14x=-20