3x+x*x=124

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Solution for 3x+x*x=124 equation:


Simplifying
3x + x * x = 124

Multiply x * x
3x + x2 = 124

Solving
3x + x2 = 124

Solving for variable 'x'.

Reorder the terms:
-124 + 3x + x2 = 124 + -124

Combine like terms: 124 + -124 = 0
-124 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '124' to each side of the equation.
-124 + 3x + 124 + x2 = 0 + 124

Reorder the terms:
-124 + 124 + 3x + x2 = 0 + 124

Combine like terms: -124 + 124 = 0
0 + 3x + x2 = 0 + 124
3x + x2 = 0 + 124

Combine like terms: 0 + 124 = 124
3x + x2 = 124

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 = 124 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 124 + 2.25

Combine like terms: 124 + 2.25 = 126.25
2.25 + 3x + x2 = 126.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 126.25

Calculate the square root of the right side: 11.236102527

Break this problem into two subproblems by setting 
(x + 1.5) equal to 11.236102527 and -11.236102527.

Subproblem 1

x + 1.5 = 11.236102527 Simplifying x + 1.5 = 11.236102527 Reorder the terms: 1.5 + x = 11.236102527 Solving 1.5 + x = 11.236102527 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 = 11.236102527 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 11.236102527 + -1.5 x = 11.236102527 + -1.5 Combine like terms: 11.236102527 + -1.5 = 9.736102527 x = 9.736102527 Simplifying x = 9.736102527

Subproblem 2

x + 1.5 = -11.236102527 Simplifying x + 1.5 = -11.236102527 Reorder the terms: 1.5 + x = -11.236102527 Solving 1.5 + x = -11.236102527 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 = -11.236102527 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -11.236102527 + -1.5 x = -11.236102527 + -1.5 Combine like terms: -11.236102527 + -1.5 = -12.736102527 x = -12.736102527 Simplifying x = -12.736102527

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.736102527, -12.736102527}

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