Solve x2 + 12x = - 20 by completing the square. Add to both sides of the equation. The value of 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 =

Question

Mathematics

Justin Hammond

28 October, 13:46

Solve x2 + 12x = - 20 by completing the square. Add to both sides of the equation. The value of 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 =

+3

Answers (2)

Know the Answer?

Samuel Ruiz · Answer 1

X2+12x=-20 / - 12x

x2=-20-12x / : 2 from the x2

x=-10-6x

Macy Yoder · Answer 2

X^2 + 12x = - 20

take the coefficient of X

divide it by 2

square that number

then add it to both sides of the equation.

12 / 2 = 6

6^2 = 36

x^2 + 12x + 36 = 16

(X+6) * (X+6) = 4*4

X+6 = 4 X = - 2

X+6 = - 4 X = - 10