Question

If using the method of completing the square to solve the quadratic equation

x^2 - 14x - 15 = 0, which number would have to be added to "complete the square"?

Answer 1

(x-7)²-64

Explanation:

x² - 14x - 15

half

(x - 7)²

-7² = 49

to get to - 15 from 49 subtract 64

so (x-7)²-64