2x^2-12x=-15

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


Simplifying
2x2 + -12x = -15

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

Solving
-12x + 2x2 = -15

Solving for variable 'x'.

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

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

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

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

Move the constant term to the right:

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

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

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -6x + x2 = 0 + -7.5
-6x + x2 = 0 + -7.5

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

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = -7.5 + 9

Reorder the terms:
9 + -6x + x2 = -7.5 + 9

Combine like terms: -7.5 + 9 = 1.5
9 + -6x + x2 = 1.5

Factor a perfect square on the left side:
(x + -3)(x + -3) = 1.5

Calculate the square root of the right side: 1.224744871

Break this problem into two subproblems by setting 
(x + -3) equal to 1.224744871 and -1.224744871.

Subproblem 1

x + -3 = 1.224744871 Simplifying x + -3 = 1.224744871 Reorder the terms: -3 + x = 1.224744871 Solving -3 + x = 1.224744871 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 1.224744871 + 3 Combine like terms: -3 + 3 = 0 0 + x = 1.224744871 + 3 x = 1.224744871 + 3 Combine like terms: 1.224744871 + 3 = 4.224744871 x = 4.224744871 Simplifying x = 4.224744871

Subproblem 2

x + -3 = -1.224744871 Simplifying x + -3 = -1.224744871 Reorder the terms: -3 + x = -1.224744871 Solving -3 + x = -1.224744871 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -1.224744871 + 3 Combine like terms: -3 + 3 = 0 0 + x = -1.224744871 + 3 x = -1.224744871 + 3 Combine like terms: -1.224744871 + 3 = 1.775255129 x = 1.775255129 Simplifying x = 1.775255129

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.224744871, 1.775255129}

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