x(x+4x)=21

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Solution for x(x+4x)=21 equation: 


Simplifying
x(x + 4x) = 21

Combine like terms: x + 4x = 5x
x(5x) = 21

Remove parenthesis around (5x)
x * 5x = 21

Reorder the terms for easier multiplication:
5x * x = 21

Multiply x * x
5x2 = 21

Solving
5x2 = 21

Solving for variable 'x'.

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

Divide each side by '5'.
x2 = 4.2

Simplifying
x2 = 4.2

Take the square root of each side:
x = {-2.049390153, 2.049390153}

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