4(x^2-4)=64

Solution for 4(x^2-4)=64 equation:

Simplifying
4(x2 + -4) = 64

Reorder the terms:
4(-4 + x2) = 64
(-4 * 4 + x2 * 4) = 64
(-16 + 4x2) = 64

Solving
-16 + 4x2 = 64

Solving for variable 'x'.

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

Add '16' to each side of the equation.
-16 + 16 + 4x2 = 64 + 16

Combine like terms: -16 + 16 = 0
0 + 4x2 = 64 + 16
4x2 = 64 + 16

Combine like terms: 64 + 16 = 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}