-x^2+10x+128=0

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Solution for -x^2+10x+128=0 equation:


Simplifying
-1x2 + 10x + 128 = 0

Reorder the terms:
128 + 10x + -1x2 = 0

Solving
128 + 10x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-128 + -10x + x2 = 0

Move the constant term to the right:

Add '128' to each side of the equation.
-128 + -10x + 128 + x2 = 0 + 128

Reorder the terms:
-128 + 128 + -10x + x2 = 0 + 128

Combine like terms: -128 + 128 = 0
0 + -10x + x2 = 0 + 128
-10x + x2 = 0 + 128

Combine like terms: 0 + 128 = 128
-10x + x2 = 128

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 128 + 25

Reorder the terms:
25 + -10x + x2 = 128 + 25

Combine like terms: 128 + 25 = 153
25 + -10x + x2 = 153

Factor a perfect square on the left side:
(x + -5)(x + -5) = 153

Calculate the square root of the right side: 12.369316877

Break this problem into two subproblems by setting 
(x + -5) equal to 12.369316877 and -12.369316877.

Subproblem 1

x + -5 = 12.369316877 Simplifying x + -5 = 12.369316877 Reorder the terms: -5 + x = 12.369316877 Solving -5 + x = 12.369316877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 12.369316877 + 5 Combine like terms: -5 + 5 = 0 0 + x = 12.369316877 + 5 x = 12.369316877 + 5 Combine like terms: 12.369316877 + 5 = 17.369316877 x = 17.369316877 Simplifying x = 17.369316877

Subproblem 2

x + -5 = -12.369316877 Simplifying x + -5 = -12.369316877 Reorder the terms: -5 + x = -12.369316877 Solving -5 + x = -12.369316877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -12.369316877 + 5 Combine like terms: -5 + 5 = 0 0 + x = -12.369316877 + 5 x = -12.369316877 + 5 Combine like terms: -12.369316877 + 5 = -7.369316877 x = -7.369316877 Simplifying x = -7.369316877

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.369316877, -7.369316877}

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