4(x^2-20)=0

Solution for 4(x^2-20)=0 equation:

Simplifying
4(x2 + -20) = 0

Reorder the terms:
4(-20 + x2) = 0
(-20 * 4 + x2 * 4) = 0
(-80 + 4x2) = 0

Solving
-80 + 4x2 = 0

Solving for variable 'x'.

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

Add '80' to each side of the equation.
-80 + 80 + 4x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 4x2 = 0 + 80
4x2 = 0 + 80

Combine like terms: 0 + 80 = 80
4x2 = 80

Divide each side by '4'.
x2 = 20

Simplifying
x2 = 20

Take the square root of each side:
x = {-4.472135955, 4.472135955}