Answer:
y = 3(x² + 3x -6)
Step-by-step explanation:
We have to rewrite the equation y = 3x² + 9x - 18 in the form of y = a(x - h)² + k.
So first step will be
y = 3(x² + 3x - 6)
y = 3(x² + 3x + 9/4 -9/4 -6) = 3(x² + 3x + 9/4 - 33/4)
y = 3(x + 3/2)² - 99/4
