Find the roots of the quadratic equation x2 - 8x = 9 by completing the square. Show your work. i need a simple answer to the question. step-by-step

Solve y = x^2 - 8x - 9 = 0

Explanation:

In this case, you don't need to solve by completing the squares.

Use the shortcut.

When (a - b + c = 0) - -> 2 real roots: (-1) and (-c/a = 9).