Question

Solve 4x2 = 12x + 40.

Answer 1

4x^2 - 12x + 40 = 0

4(x^2 - 3x + 10) = 0

x^2 - 3x + 10 = 0

Answer 2

move all the terms to the left sides:

4x^2-12x-40=0

Now notice we can factor out a 4, resulting in: 4(x^2-3x-10)

Now you have to find factor just the part inside the parenthese, to do that find two numbers that multiply to be -10 and add to be -3

Answer 3

4x^2-12x -40 =0
x=-2
x=5