(4x)(x)=81

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Solution for (4x)(x)=81 equation: 


Simplifying
(4x)(x) = 81

Remove parenthesis around (4x)
4x(x) = 81

Multiply x * x
4x2 = 81

Solving
4x2 = 81

Solving for variable 'x'.

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

Divide each side by '4'.
x2 = 20.25

Simplifying
x2 = 20.25

Take the square root of each side:
x = {-4.5, 4.5}

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