26x-x^2=-128

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Solution for 26x-x^2=-128 equation:


Simplifying
26x + -1x2 = -128

Solving
26x + -1x2 = -128

Solving for variable 'x'.

Reorder the terms:
128 + 26x + -1x2 = -128 + 128

Combine like terms: -128 + 128 = 0
128 + 26x + -1x2 = 0

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

Divide each side by '-1'.
-128 + -26x + x2 = 0

Move the constant term to the right:

Add '128' to each side of the equation.
-128 + -26x + 128 + x2 = 0 + 128

Reorder the terms:
-128 + 128 + -26x + x2 = 0 + 128

Combine like terms: -128 + 128 = 0
0 + -26x + x2 = 0 + 128
-26x + x2 = 0 + 128

Combine like terms: 0 + 128 = 128
-26x + x2 = 128

The x term is -26x.  Take half its coefficient (-13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
-26x + 169 + x2 = 128 + 169

Reorder the terms:
169 + -26x + x2 = 128 + 169

Combine like terms: 128 + 169 = 297
169 + -26x + x2 = 297

Factor a perfect square on the left side:
(x + -13)(x + -13) = 297

Calculate the square root of the right side: 17.23368794

Break this problem into two subproblems by setting 
(x + -13) equal to 17.23368794 and -17.23368794.

Subproblem 1

x + -13 = 17.23368794 Simplifying x + -13 = 17.23368794 Reorder the terms: -13 + x = 17.23368794 Solving -13 + x = 17.23368794 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x = 17.23368794 + 13 Combine like terms: -13 + 13 = 0 0 + x = 17.23368794 + 13 x = 17.23368794 + 13 Combine like terms: 17.23368794 + 13 = 30.23368794 x = 30.23368794 Simplifying x = 30.23368794

Subproblem 2

x + -13 = -17.23368794 Simplifying x + -13 = -17.23368794 Reorder the terms: -13 + x = -17.23368794 Solving -13 + x = -17.23368794 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x = -17.23368794 + 13 Combine like terms: -13 + 13 = 0 0 + x = -17.23368794 + 13 x = -17.23368794 + 13 Combine like terms: -17.23368794 + 13 = -4.23368794 x = -4.23368794 Simplifying x = -4.23368794

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30.23368794, -4.23368794}

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