X+3x(x+4)=20

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Solution for X+3x(x+4)=20 equation: 


Simplifying
X + 3x(x + 4) = 20

Reorder the terms:
X + 3x(4 + x) = 20
X + (4 * 3x + x * 3x) = 20
X + (12x + 3x2) = 20

Solving
X + 12x + 3x2 = 20

Solving for variable 'X'.

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

Add '-12x' to each side of the equation.
X + 12x + -12x + 3x2 = 20 + -12x

Combine like terms: 12x + -12x = 0
X + 0 + 3x2 = 20 + -12x
X + 3x2 = 20 + -12x

Add '-3x2' to each side of the equation.
X + 3x2 + -3x2 = 20 + -12x + -3x2

Combine like terms: 3x2 + -3x2 = 0
X + 0 = 20 + -12x + -3x2
X = 20 + -12x + -3x2

Simplifying
X = 20 + -12x + -3x2

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