x^2+15x+36=180

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Solution for x^2+15x+36=180 equation:


Simplifying
x2 + 15x + 36 = 180

Reorder the terms:
36 + 15x + x2 = 180

Solving
36 + 15x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
36 + -180 + 15x + x2 = 180 + -180

Combine like terms: 36 + -180 = -144
-144 + 15x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-144 + 15x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '144' to each side of the equation.
-144 + 15x + 144 + x2 = 0 + 144

Reorder the terms:
-144 + 144 + 15x + x2 = 0 + 144

Combine like terms: -144 + 144 = 0
0 + 15x + x2 = 0 + 144
15x + x2 = 0 + 144

Combine like terms: 0 + 144 = 144
15x + x2 = 144

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 = 144 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 144 + 56.25

Combine like terms: 144 + 56.25 = 200.25
56.25 + 15x + x2 = 200.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 200.25

Calculate the square root of the right side: 14.150971698

Break this problem into two subproblems by setting 
(x + 7.5) equal to 14.150971698 and -14.150971698.

Subproblem 1

x + 7.5 = 14.150971698 Simplifying x + 7.5 = 14.150971698 Reorder the terms: 7.5 + x = 14.150971698 Solving 7.5 + x = 14.150971698 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 = 14.150971698 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 14.150971698 + -7.5 x = 14.150971698 + -7.5 Combine like terms: 14.150971698 + -7.5 = 6.650971698 x = 6.650971698 Simplifying x = 6.650971698

Subproblem 2

x + 7.5 = -14.150971698 Simplifying x + 7.5 = -14.150971698 Reorder the terms: 7.5 + x = -14.150971698 Solving 7.5 + x = -14.150971698 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 = -14.150971698 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -14.150971698 + -7.5 x = -14.150971698 + -7.5 Combine like terms: -14.150971698 + -7.5 = -21.650971698 x = -21.650971698 Simplifying x = -21.650971698

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.650971698, -21.650971698}

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