(x^2+3x)=150

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Solution for (x^2+3x)=150 equation:


Simplifying
(x2 + 3x) = 150

Reorder the terms:
(3x + x2) = 150

Remove parenthesis around (3x + x2)
3x + x2 = 150

Solving
3x + x2 = 150

Solving for variable 'x'.

Reorder the terms:
-150 + 3x + x2 = 150 + -150

Combine like terms: 150 + -150 = 0
-150 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '150' to each side of the equation.
-150 + 3x + 150 + x2 = 0 + 150

Reorder the terms:
-150 + 150 + 3x + x2 = 0 + 150

Combine like terms: -150 + 150 = 0
0 + 3x + x2 = 0 + 150
3x + x2 = 0 + 150

Combine like terms: 0 + 150 = 150
3x + x2 = 150

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 150 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 150 + 2.25

Combine like terms: 150 + 2.25 = 152.25
2.25 + 3x + x2 = 152.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 152.25

Calculate the square root of the right side: 12.338962679

Break this problem into two subproblems by setting 
(x + 1.5) equal to 12.338962679 and -12.338962679.

Subproblem 1

x + 1.5 = 12.338962679 Simplifying x + 1.5 = 12.338962679 Reorder the terms: 1.5 + x = 12.338962679 Solving 1.5 + x = 12.338962679 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 12.338962679 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 12.338962679 + -1.5 x = 12.338962679 + -1.5 Combine like terms: 12.338962679 + -1.5 = 10.838962679 x = 10.838962679 Simplifying x = 10.838962679

Subproblem 2

x + 1.5 = -12.338962679 Simplifying x + 1.5 = -12.338962679 Reorder the terms: 1.5 + x = -12.338962679 Solving 1.5 + x = -12.338962679 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -12.338962679 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -12.338962679 + -1.5 x = -12.338962679 + -1.5 Combine like terms: -12.338962679 + -1.5 = -13.838962679 x = -13.838962679 Simplifying x = -13.838962679

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.838962679, -13.838962679}

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