-x^2-15x+600=0

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Solution for -x^2-15x+600=0 equation:


Simplifying
-1x2 + -15x + 600 = 0

Reorder the terms:
600 + -15x + -1x2 = 0

Solving
600 + -15x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-600 + 15x + x2 = 0

Move the constant term to the right:

Add '600' to each side of the equation.
-600 + 15x + 600 + x2 = 0 + 600

Reorder the terms:
-600 + 600 + 15x + x2 = 0 + 600

Combine like terms: -600 + 600 = 0
0 + 15x + x2 = 0 + 600
15x + x2 = 0 + 600

Combine like terms: 0 + 600 = 600
15x + x2 = 600

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 = 600 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 600 + 56.25

Combine like terms: 600 + 56.25 = 656.25
56.25 + 15x + x2 = 656.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 656.25

Calculate the square root of the right side: 25.617376915

Break this problem into two subproblems by setting 
(x + 7.5) equal to 25.617376915 and -25.617376915.

Subproblem 1

x + 7.5 = 25.617376915 Simplifying x + 7.5 = 25.617376915 Reorder the terms: 7.5 + x = 25.617376915 Solving 7.5 + x = 25.617376915 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 = 25.617376915 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 25.617376915 + -7.5 x = 25.617376915 + -7.5 Combine like terms: 25.617376915 + -7.5 = 18.117376915 x = 18.117376915 Simplifying x = 18.117376915

Subproblem 2

x + 7.5 = -25.617376915 Simplifying x + 7.5 = -25.617376915 Reorder the terms: 7.5 + x = -25.617376915 Solving 7.5 + x = -25.617376915 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 = -25.617376915 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -25.617376915 + -7.5 x = -25.617376915 + -7.5 Combine like terms: -25.617376915 + -7.5 = -33.117376915 x = -33.117376915 Simplifying x = -33.117376915

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.117376915, -33.117376915}

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