x^2+15x=360

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Solution for x^2+15x=360 equation:


Simplifying
x2 + 15x = 360

Reorder the terms:
15x + x2 = 360

Solving
15x + x2 = 360

Solving for variable 'x'.

Reorder the terms:
-360 + 15x + x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-360 + 15x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '360' to each side of the equation.
-360 + 15x + 360 + x2 = 0 + 360

Reorder the terms:
-360 + 360 + 15x + x2 = 0 + 360

Combine like terms: -360 + 360 = 0
0 + 15x + x2 = 0 + 360
15x + x2 = 0 + 360

Combine like terms: 0 + 360 = 360
15x + x2 = 360

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 = 360 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 360 + 56.25

Combine like terms: 360 + 56.25 = 416.25
56.25 + 15x + x2 = 416.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 416.25

Calculate the square root of the right side: 20.402205763

Break this problem into two subproblems by setting 
(x + 7.5) equal to 20.402205763 and -20.402205763.

Subproblem 1

x + 7.5 = 20.402205763 Simplifying x + 7.5 = 20.402205763 Reorder the terms: 7.5 + x = 20.402205763 Solving 7.5 + x = 20.402205763 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 = 20.402205763 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 20.402205763 + -7.5 x = 20.402205763 + -7.5 Combine like terms: 20.402205763 + -7.5 = 12.902205763 x = 12.902205763 Simplifying x = 12.902205763

Subproblem 2

x + 7.5 = -20.402205763 Simplifying x + 7.5 = -20.402205763 Reorder the terms: 7.5 + x = -20.402205763 Solving 7.5 + x = -20.402205763 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 = -20.402205763 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -20.402205763 + -7.5 x = -20.402205763 + -7.5 Combine like terms: -20.402205763 + -7.5 = -27.902205763 x = -27.902205763 Simplifying x = -27.902205763

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.902205763, -27.902205763}

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