x^2+15x=176

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Solution for x^2+15x=176 equation:


Simplifying
x2 + 15x = 176

Reorder the terms:
15x + x2 = 176

Solving
15x + x2 = 176

Solving for variable 'x'.

Reorder the terms:
-176 + 15x + x2 = 176 + -176

Combine like terms: 176 + -176 = 0
-176 + 15x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '176' to each side of the equation.
-176 + 15x + 176 + x2 = 0 + 176

Reorder the terms:
-176 + 176 + 15x + x2 = 0 + 176

Combine like terms: -176 + 176 = 0
0 + 15x + x2 = 0 + 176
15x + x2 = 0 + 176

Combine like terms: 0 + 176 = 176
15x + x2 = 176

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 = 176 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 176 + 56.25

Combine like terms: 176 + 56.25 = 232.25
56.25 + 15x + x2 = 232.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 232.25

Calculate the square root of the right side: 15.239750654

Break this problem into two subproblems by setting 
(x + 7.5) equal to 15.239750654 and -15.239750654.

Subproblem 1

x + 7.5 = 15.239750654 Simplifying x + 7.5 = 15.239750654 Reorder the terms: 7.5 + x = 15.239750654 Solving 7.5 + x = 15.239750654 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 = 15.239750654 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 15.239750654 + -7.5 x = 15.239750654 + -7.5 Combine like terms: 15.239750654 + -7.5 = 7.739750654 x = 7.739750654 Simplifying x = 7.739750654

Subproblem 2

x + 7.5 = -15.239750654 Simplifying x + 7.5 = -15.239750654 Reorder the terms: 7.5 + x = -15.239750654 Solving 7.5 + x = -15.239750654 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 = -15.239750654 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -15.239750654 + -7.5 x = -15.239750654 + -7.5 Combine like terms: -15.239750654 + -7.5 = -22.739750654 x = -22.739750654 Simplifying x = -22.739750654

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.739750654, -22.739750654}

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