x^2-36=15x

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Solution for x^2-36=15x equation:


Simplifying
x2 + -36 = 15x

Reorder the terms:
-36 + x2 = 15x

Solving
-36 + x2 = 15x

Solving for variable 'x'.

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

Combine like terms: 15x + -15x = 0
-36 + -15x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -15x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + -15x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -15x + x2 = 0 + 36
-15x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
-15x + x2 = 36

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 = 36 + 56.25

Reorder the terms:
56.25 + -15x + x2 = 36 + 56.25

Combine like terms: 36 + 56.25 = 92.25
56.25 + -15x + x2 = 92.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 92.25

Calculate the square root of the right side: 9.604686356

Break this problem into two subproblems by setting 
(x + -7.5) equal to 9.604686356 and -9.604686356.

Subproblem 1

x + -7.5 = 9.604686356 Simplifying x + -7.5 = 9.604686356 Reorder the terms: -7.5 + x = 9.604686356 Solving -7.5 + x = 9.604686356 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 = 9.604686356 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 9.604686356 + 7.5 x = 9.604686356 + 7.5 Combine like terms: 9.604686356 + 7.5 = 17.104686356 x = 17.104686356 Simplifying x = 17.104686356

Subproblem 2

x + -7.5 = -9.604686356 Simplifying x + -7.5 = -9.604686356 Reorder the terms: -7.5 + x = -9.604686356 Solving -7.5 + x = -9.604686356 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 = -9.604686356 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -9.604686356 + 7.5 x = -9.604686356 + 7.5 Combine like terms: -9.604686356 + 7.5 = -2.104686356 x = -2.104686356 Simplifying x = -2.104686356

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.104686356, -2.104686356}

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