Question

To solve the equation x^2 - 8x = 12 by completing the square, what number must be added to both sides of the equation?

Answer 1

x² - 8x = 12

x² - 8x + ((1/2)(8))² = 12 + 16

x² - 8x + 16 = 28

16 must be added to both sides of this equation.