x^2-16x=-11.5

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Solution for x^2-16x=-11.5 equation:


Simplifying
x2 + -16x = -11.5

Reorder the terms:
-16x + x2 = -11.5

Solving
-16x + x2 = -11.5

Solving for variable 'x'.

Reorder the terms:
11.5 + -16x + x2 = -11.5 + 11.5

Combine like terms: -11.5 + 11.5 = 0.0
11.5 + -16x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '-11.5' to each side of the equation.
11.5 + -16x + -11.5 + x2 = 0.0 + -11.5

Reorder the terms:
11.5 + -11.5 + -16x + x2 = 0.0 + -11.5

Combine like terms: 11.5 + -11.5 = 0.0
0.0 + -16x + x2 = 0.0 + -11.5
-16x + x2 = 0.0 + -11.5

Combine like terms: 0.0 + -11.5 = -11.5
-16x + x2 = -11.5

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = -11.5 + 64

Reorder the terms:
64 + -16x + x2 = -11.5 + 64

Combine like terms: -11.5 + 64 = 52.5
64 + -16x + x2 = 52.5

Factor a perfect square on the left side:
(x + -8)(x + -8) = 52.5

Calculate the square root of the right side: 7.245688373

Break this problem into two subproblems by setting 
(x + -8) equal to 7.245688373 and -7.245688373.

Subproblem 1

x + -8 = 7.245688373 Simplifying x + -8 = 7.245688373 Reorder the terms: -8 + x = 7.245688373 Solving -8 + x = 7.245688373 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 7.245688373 + 8 Combine like terms: -8 + 8 = 0 0 + x = 7.245688373 + 8 x = 7.245688373 + 8 Combine like terms: 7.245688373 + 8 = 15.245688373 x = 15.245688373 Simplifying x = 15.245688373

Subproblem 2

x + -8 = -7.245688373 Simplifying x + -8 = -7.245688373 Reorder the terms: -8 + x = -7.245688373 Solving -8 + x = -7.245688373 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -7.245688373 + 8 Combine like terms: -8 + 8 = 0 0 + x = -7.245688373 + 8 x = -7.245688373 + 8 Combine like terms: -7.245688373 + 8 = 0.754311627 x = 0.754311627 Simplifying x = 0.754311627

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.245688373, 0.754311627}

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