4x*2x-4=40

Solution for 4x*2x-4=40 equation:

Simplifying
4x * 2x + -4 = 40

Reorder the terms for easier multiplication:
4 * 2x * x + -4 = 40

Multiply 4 * 2
8x * x + -4 = 40

Multiply x * x
8x2 + -4 = 40

Reorder the terms:
-4 + 8x2 = 40

Solving
-4 + 8x2 = 40

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + 8x2 = 40 + 4

Combine like terms: -4 + 4 = 0
0 + 8x2 = 40 + 4
8x2 = 40 + 4

Combine like terms: 40 + 4 = 44
8x2 = 44

Divide each side by '8'.
x2 = 5.5

Simplifying
x2 = 5.5

Take the square root of each side:
x = {-2.34520788, 2.34520788}