(x^2-15)+(x(x-1))=180

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Solution for (x^2-15)+(x(x-1))=180 equation:


Simplifying
(x2 + -15) + (x(x + -1)) = 180

Reorder the terms:
(-15 + x2) + (x(x + -1)) = 180

Remove parenthesis around (-15 + x2)
-15 + x2 + (x(x + -1)) = 180

Reorder the terms:
-15 + x2 + (x(-1 + x)) = 180
-15 + x2 + ((-1 * x + x * x)) = 180
-15 + x2 + ((-1x + x2)) = 180
-15 + x2 + (-1x + x2) = 180

Remove parenthesis around (-1x + x2)
-15 + x2 + -1x + x2 = 180

Reorder the terms:
-15 + -1x + x2 + x2 = 180

Combine like terms: x2 + x2 = 2x2
-15 + -1x + 2x2 = 180

Solving
-15 + -1x + 2x2 = 180

Solving for variable 'x'.

Reorder the terms:
-15 + -180 + -1x + 2x2 = 180 + -180

Combine like terms: -15 + -180 = -195
-195 + -1x + 2x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-195 + -1x + 2x2 = 0

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

Divide each side by '2'.
-97.5 + -0.5x + x2 = 0

Move the constant term to the right:

Add '97.5' to each side of the equation.
-97.5 + -0.5x + 97.5 + x2 = 0 + 97.5

Reorder the terms:
-97.5 + 97.5 + -0.5x + x2 = 0 + 97.5

Combine like terms: -97.5 + 97.5 = 0.0
0.0 + -0.5x + x2 = 0 + 97.5
-0.5x + x2 = 0 + 97.5

Combine like terms: 0 + 97.5 = 97.5
-0.5x + x2 = 97.5

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 97.5 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 97.5 + 0.0625

Combine like terms: 97.5 + 0.0625 = 97.5625
0.0625 + -0.5x + x2 = 97.5625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 97.5625

Calculate the square root of the right side: 9.877373133

Break this problem into two subproblems by setting 
(x + -0.25) equal to 9.877373133 and -9.877373133.

Subproblem 1

x + -0.25 = 9.877373133 Simplifying x + -0.25 = 9.877373133 Reorder the terms: -0.25 + x = 9.877373133 Solving -0.25 + x = 9.877373133 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 9.877373133 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 9.877373133 + 0.25 x = 9.877373133 + 0.25 Combine like terms: 9.877373133 + 0.25 = 10.127373133 x = 10.127373133 Simplifying x = 10.127373133

Subproblem 2

x + -0.25 = -9.877373133 Simplifying x + -0.25 = -9.877373133 Reorder the terms: -0.25 + x = -9.877373133 Solving -0.25 + x = -9.877373133 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -9.877373133 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -9.877373133 + 0.25 x = -9.877373133 + 0.25 Combine like terms: -9.877373133 + 0.25 = -9.627373133 x = -9.627373133 Simplifying x = -9.627373133

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.127373133, -9.627373133}

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