X+3x+(3x)(3x)=840

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Solution for X+3x+(3x)(3x)=840 equation: 


Simplifying
X + 3x + (3x)(3x) = 840

Remove parenthesis around (3x)
X + 3x + 3x(3x) = 840

Remove parenthesis around (3x)
X + 3x + 3x * 3x = 840

Reorder the terms for easier multiplication:
X + 3x + 3 * 3x * x = 840

Multiply 3 * 3
X + 3x + 9x * x = 840

Multiply x * x
X + 3x + 9x2 = 840

Solving
X + 3x + 9x2 = 840

Solving for variable 'X'.

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

Add '-3x' to each side of the equation.
X + 3x + -3x + 9x2 = 840 + -3x

Combine like terms: 3x + -3x = 0
X + 0 + 9x2 = 840 + -3x
X + 9x2 = 840 + -3x

Add '-9x2' to each side of the equation.
X + 9x2 + -9x2 = 840 + -3x + -9x2

Combine like terms: 9x2 + -9x2 = 0
X + 0 = 840 + -3x + -9x2
X = 840 + -3x + -9x2

Simplifying
X = 840 + -3x + -9x2

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