2x^2-12=15x

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Solution for 2x^2-12=15x equation:


Simplifying
2x2 + -12 = 15x

Reorder the terms:
-12 + 2x2 = 15x

Solving
-12 + 2x2 = 15x

Solving for variable 'x'.

Reorder the terms:
-12 + -15x + 2x2 = 15x + -15x

Combine like terms: 15x + -15x = 0
-12 + -15x + 2x2 = 0

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

Divide each side by '2'.
-6 + -7.5x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -7.5x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -7.5x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -7.5x + x2 = 0 + 6
-7.5x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-7.5x + x2 = 6

The x term is -7.5x.  Take half its coefficient (-3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
-7.5x + 14.0625 + x2 = 6 + 14.0625

Reorder the terms:
14.0625 + -7.5x + x2 = 6 + 14.0625

Combine like terms: 6 + 14.0625 = 20.0625
14.0625 + -7.5x + x2 = 20.0625

Factor a perfect square on the left side:
(x + -3.75)(x + -3.75) = 20.0625

Calculate the square root of the right side: 4.479118217

Break this problem into two subproblems by setting 
(x + -3.75) equal to 4.479118217 and -4.479118217.

Subproblem 1

x + -3.75 = 4.479118217 Simplifying x + -3.75 = 4.479118217 Reorder the terms: -3.75 + x = 4.479118217 Solving -3.75 + x = 4.479118217 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + x = 4.479118217 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = 4.479118217 + 3.75 x = 4.479118217 + 3.75 Combine like terms: 4.479118217 + 3.75 = 8.229118217 x = 8.229118217 Simplifying x = 8.229118217

Subproblem 2

x + -3.75 = -4.479118217 Simplifying x + -3.75 = -4.479118217 Reorder the terms: -3.75 + x = -4.479118217 Solving -3.75 + x = -4.479118217 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + x = -4.479118217 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = -4.479118217 + 3.75 x = -4.479118217 + 3.75 Combine like terms: -4.479118217 + 3.75 = -0.729118217 x = -0.729118217 Simplifying x = -0.729118217

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.229118217, -0.729118217}

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