Solve x2 + 12x = –20 by completing the square. Add to both sides of the equation. The value of in this equation is . Write the l
eft 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 =
X^2 +12x = -20 <span>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 </span> x^2 +12x +36 = 16 (X+6) * (X+6) = 4*4 X+6 = 4 X= -2 X+6 = -4 X= -10
