Question

Kelly is solving x^2 - 4x = 7 by completing the square. What number will Kelly add to both sides of the equation?

Answer 1

To complete the square, you add $\frac{b}{2}^2$ to both sides

so $\frac{4}{2}^2$

$2^2$

4

$x^2 - 4x + 4=7 + 4$