0=x^2-26x-7

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Solution for 0=x^2-26x-7 equation:


Simplifying
0 = x2 + -26x + -7

Reorder the terms:
0 = -7 + -26x + x2

Solving
0 = -7 + -26x + x2

Solving for variable 'x'.

Combine like terms: 0 + 7 = 7
7 + 26x + -1x2 = -7 + -26x + x2 + 7 + 26x + -1x2

Reorder the terms:
7 + 26x + -1x2 = -7 + 7 + -26x + 26x + x2 + -1x2

Combine like terms: -7 + 7 = 0
7 + 26x + -1x2 = 0 + -26x + 26x + x2 + -1x2
7 + 26x + -1x2 = -26x + 26x + x2 + -1x2

Combine like terms: -26x + 26x = 0
7 + 26x + -1x2 = 0 + x2 + -1x2
7 + 26x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
7 + 26x + -1x2 = 0

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

Divide each side by '-1'.
-7 + -26x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -26x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -26x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -26x + x2 = 0 + 7
-26x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-26x + x2 = 7

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 = 7 + 169

Reorder the terms:
169 + -26x + x2 = 7 + 169

Combine like terms: 7 + 169 = 176
169 + -26x + x2 = 176

Factor a perfect square on the left side:
(x + -13)(x + -13) = 176

Calculate the square root of the right side: 13.266499161

Break this problem into two subproblems by setting 
(x + -13) equal to 13.266499161 and -13.266499161.

Subproblem 1

x + -13 = 13.266499161 Simplifying x + -13 = 13.266499161 Reorder the terms: -13 + x = 13.266499161 Solving -13 + x = 13.266499161 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 = 13.266499161 + 13 Combine like terms: -13 + 13 = 0 0 + x = 13.266499161 + 13 x = 13.266499161 + 13 Combine like terms: 13.266499161 + 13 = 26.266499161 x = 26.266499161 Simplifying x = 26.266499161

Subproblem 2

x + -13 = -13.266499161 Simplifying x + -13 = -13.266499161 Reorder the terms: -13 + x = -13.266499161 Solving -13 + x = -13.266499161 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 = -13.266499161 + 13 Combine like terms: -13 + 13 = 0 0 + x = -13.266499161 + 13 x = -13.266499161 + 13 Combine like terms: -13.266499161 + 13 = -0.266499161 x = -0.266499161 Simplifying x = -0.266499161

Solution

The solution to the problem is based on the solutions from the subproblems. x = {26.266499161, -0.266499161}

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