64=x(4x)

Solution for 64=x(4x) equation:

Simplifying
64 = x(4x)

Remove parenthesis around (4x)
64 = x * 4x

Reorder the terms for easier multiplication:
64 = 4x * x

Multiply x * x
64 = 4x2

Solving
64 = 4x2

Solving for variable 'x'.

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

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

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

Add '-64' to each side of the equation.
64 + -64 + -4x2 = 0 + -64

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

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

Divide each side by '-4'.
x2 = 16

Simplifying
x2 = 16

Take the square root of each side:
x = {-4, 4}