Answer:
(x + 7)² = -72
Explanation:
-3x² - 42x - 375 = -12
the steps for completing the square are as follows:
-3x² - 42x = -12 + 375
-3x² - 42x = 363
dividing the equation by -3
x² + 14x = -121
taking the half of x term i.e. 7
adding the square of the half of the x term to both sides:
x² + 14x + 49 = -121 + 49
(x + 7)² = -72
is the intermediate step in the form of (x + a)² = b