What is the constant that should be added to the binomial x^2+12x?

Step-by-step explanation:

Remark

They are alternate interior angles and therefore equal.

Solution

8x - 10 = 3x + 90              Subtract 3x from both sides

8x - 3x - 10 = 90               Combine the left

5x - 10 = 90                      Add 10 to both sides

5x = 90 + 10

5x = 100                           Divide by 5

x = 20      

That isn't the answer. You need 3x + 90

<B = 3*20 + 90

<B = 60 + 90

<B = 150