x^2-16x=-8

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Solution for x^2-16x=-8 equation:


Simplifying
x2 + -16x = -8

Reorder the terms:
-16x + x2 = -8

Solving
-16x + x2 = -8

Solving for variable 'x'.

Reorder the terms:
8 + -16x + x2 = -8 + 8

Combine like terms: -8 + 8 = 0
8 + -16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -16x + -8 + x2 = 0 + -8

Reorder the terms:
8 + -8 + -16x + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -16x + x2 = 0 + -8
-16x + x2 = 0 + -8

Combine like terms: 0 + -8 = -8
-16x + x2 = -8

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 = -8 + 64

Reorder the terms:
64 + -16x + x2 = -8 + 64

Combine like terms: -8 + 64 = 56
64 + -16x + x2 = 56

Factor a perfect square on the left side:
(x + -8)(x + -8) = 56

Calculate the square root of the right side: 7.483314774

Break this problem into two subproblems by setting 
(x + -8) equal to 7.483314774 and -7.483314774.

Subproblem 1

x + -8 = 7.483314774 Simplifying x + -8 = 7.483314774 Reorder the terms: -8 + x = 7.483314774 Solving -8 + x = 7.483314774 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 = 7.483314774 + 8 Combine like terms: -8 + 8 = 0 0 + x = 7.483314774 + 8 x = 7.483314774 + 8 Combine like terms: 7.483314774 + 8 = 15.483314774 x = 15.483314774 Simplifying x = 15.483314774

Subproblem 2

x + -8 = -7.483314774 Simplifying x + -8 = -7.483314774 Reorder the terms: -8 + x = -7.483314774 Solving -8 + x = -7.483314774 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 = -7.483314774 + 8 Combine like terms: -8 + 8 = 0 0 + x = -7.483314774 + 8 x = -7.483314774 + 8 Combine like terms: -7.483314774 + 8 = 0.516685226 x = 0.516685226 Simplifying x = 0.516685226

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.483314774, 0.516685226}

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