Solve for x in the equation below:

x² + 16x=36

A

B

C

D

12, 3

-12,3

18-2

-18,2

x = 2 or x = - 18

Step-by-step explanation:

Solve for x:

x^2 + 16 x = 36

Add 64 to both sides:

x^2 + 16 x + 64 = 100

Write the left hand side as a square:

(x + 8) ^2 = 100

Take the square root of both sides:

x + 8 = 10 or x + 8 = - 10

Subtract 8 from both sides:

x = 2 or x + 8 = - 10

Subtract 8 from both sides:

Answer: x = 2 or x = - 18