Question

Placed the following quadratic in vertex form by completing the square and then state the coordinates of its vertex?

Y=x^2+18x-12

Answer 1

y = (x + 9)² -93

vertex: (-9, -93)

Explanation:

x² + 18x = 12

x² + 18x + 81 = 12 + 81

(x+9)² = 93

y = (x + 9)² -93

vertex: (-9, -93)