4x^2-20=40

Solution for 4x^2-20=40 equation:

Simplifying
4x2 + -20 = 40

Reorder the terms:
-20 + 4x2 = 40

Solving
-20 + 4x2 = 40

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '20' to each side of the equation.
-20 + 20 + 4x2 = 40 + 20

Combine like terms: -20 + 20 = 0
0 + 4x2 = 40 + 20
4x2 = 40 + 20

Combine like terms: 40 + 20 = 60
4x2 = 60

Divide each side by '4'.
x2 = 15

Simplifying
x2 = 15

Take the square root of each side:
x = {-3.872983346, 3.872983346}