4X^2+20-40=0

Solution for 4X^2+20-40=0 equation:

Simplifying
4X2 + 20 + -40 = 0

Reorder the terms:
20 + -40 + 4X2 = 0

Combine like terms: 20 + -40 = -20
-20 + 4X2 = 0

Solving
-20 + 4X2 = 0

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 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 4X2 = 0 + 20
4X2 = 0 + 20

Combine like terms: 0 + 20 = 20
4X2 = 20

Divide each side by '4'.
X2 = 5

Simplifying
X2 = 5

Take the square root of each side:
X = {-2.236067978, 2.236067978}