x^2+15x=124

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Solution for x^2+15x=124 equation:


Simplifying
x2 + 15x = 124

Reorder the terms:
15x + x2 = 124

Solving
15x + x2 = 124

Solving for variable 'x'.

Reorder the terms:
-124 + 15x + x2 = 124 + -124

Combine like terms: 124 + -124 = 0
-124 + 15x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '124' to each side of the equation.
-124 + 15x + 124 + x2 = 0 + 124

Reorder the terms:
-124 + 124 + 15x + x2 = 0 + 124

Combine like terms: -124 + 124 = 0
0 + 15x + x2 = 0 + 124
15x + x2 = 0 + 124

Combine like terms: 0 + 124 = 124
15x + x2 = 124

The x term is 15x.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15x + 56.25 + x2 = 124 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 124 + 56.25

Combine like terms: 124 + 56.25 = 180.25
56.25 + 15x + x2 = 180.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 180.25

Calculate the square root of the right side: 13.425721582

Break this problem into two subproblems by setting 
(x + 7.5) equal to 13.425721582 and -13.425721582.

Subproblem 1

x + 7.5 = 13.425721582 Simplifying x + 7.5 = 13.425721582 Reorder the terms: 7.5 + x = 13.425721582 Solving 7.5 + x = 13.425721582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = 13.425721582 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 13.425721582 + -7.5 x = 13.425721582 + -7.5 Combine like terms: 13.425721582 + -7.5 = 5.925721582 x = 5.925721582 Simplifying x = 5.925721582

Subproblem 2

x + 7.5 = -13.425721582 Simplifying x + 7.5 = -13.425721582 Reorder the terms: 7.5 + x = -13.425721582 Solving 7.5 + x = -13.425721582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = -13.425721582 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -13.425721582 + -7.5 x = -13.425721582 + -7.5 Combine like terms: -13.425721582 + -7.5 = -20.925721582 x = -20.925721582 Simplifying x = -20.925721582

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.925721582, -20.925721582}

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