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 equation becomes ( )2. Use the square root property of equality. Isolate the variable: x =

Answer 1

Answer:

x=-2,x=-10

Step-by-step explanation:

x²+12x=-20

add both sides (12/2)^2 ,i.e.,36

x+2+12x+36=-20+36

(x+6)²=16=4²

x+6=±4

either x+6=4

x=4-6

x=-2

or x+6=-4

x=-4-6

x=-10

Answer 2

Answer:

36

x+6

-10 or -2

Step-by-step explanation: