Question

Y=x2–2x–9. Write the equation in vertex form.

Answer 1

y = (x - 1)² - 10

Explanation:

y = x² - 2x - 9

using the method of completing the square

add/subtract ( half the coefficient of the x- term )² to x² - 2x

y = x² + 2(- 1)x + 1 - 1 - 9

y = (x - 1)² - 10 ← in vertex form