x(x+3x)=30

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Solution for x(x+3x)=30 equation: 


Simplifying
x(x + 3x) = 30

Combine like terms: x + 3x = 4x
x(4x) = 30

Remove parenthesis around (4x)
x * 4x = 30

Reorder the terms for easier multiplication:
4x * x = 30

Multiply x * x
4x2 = 30

Solving
4x2 = 30

Solving for variable 'x'.

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

Divide each side by '4'.
x2 = 7.5

Simplifying
x2 = 7.5

Take the square root of each side:
x = {-2.738612788, 2.738612788}

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