x^2+15x-183.75=0

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Solution for x^2+15x-183.75=0 equation:


Simplifying
x2 + 15x + -183.75 = 0

Reorder the terms:
-183.75 + 15x + x2 = 0

Solving
-183.75 + 15x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '183.75' to each side of the equation.
-183.75 + 15x + 183.75 + x2 = 0 + 183.75

Reorder the terms:
-183.75 + 183.75 + 15x + x2 = 0 + 183.75

Combine like terms: -183.75 + 183.75 = 0.00
0.00 + 15x + x2 = 0 + 183.75
15x + x2 = 0 + 183.75

Combine like terms: 0 + 183.75 = 183.75
15x + x2 = 183.75

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 = 183.75 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 183.75 + 56.25

Combine like terms: 183.75 + 56.25 = 240
56.25 + 15x + x2 = 240

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 240

Calculate the square root of the right side: 15.491933385

Break this problem into two subproblems by setting 
(x + 7.5) equal to 15.491933385 and -15.491933385.

Subproblem 1

x + 7.5 = 15.491933385 Simplifying x + 7.5 = 15.491933385 Reorder the terms: 7.5 + x = 15.491933385 Solving 7.5 + x = 15.491933385 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 = 15.491933385 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 15.491933385 + -7.5 x = 15.491933385 + -7.5 Combine like terms: 15.491933385 + -7.5 = 7.991933385 x = 7.991933385 Simplifying x = 7.991933385

Subproblem 2

x + 7.5 = -15.491933385 Simplifying x + 7.5 = -15.491933385 Reorder the terms: 7.5 + x = -15.491933385 Solving 7.5 + x = -15.491933385 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 = -15.491933385 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -15.491933385 + -7.5 x = -15.491933385 + -7.5 Combine like terms: -15.491933385 + -7.5 = -22.991933385 x = -22.991933385 Simplifying x = -22.991933385

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.991933385, -22.991933385}

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