x^2-26x=9

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Solution for x^2-26x=9 equation:


Simplifying
x2 + -26x = 9

Reorder the terms:
-26x + x2 = 9

Solving
-26x + x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + -26x + x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -26x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -26x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -26x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -26x + x2 = 0 + 9
-26x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-26x + x2 = 9

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 = 9 + 169

Reorder the terms:
169 + -26x + x2 = 9 + 169

Combine like terms: 9 + 169 = 178
169 + -26x + x2 = 178

Factor a perfect square on the left side:
(x + -13)(x + -13) = 178

Calculate the square root of the right side: 13.341664064

Break this problem into two subproblems by setting 
(x + -13) equal to 13.341664064 and -13.341664064.

Subproblem 1

x + -13 = 13.341664064 Simplifying x + -13 = 13.341664064 Reorder the terms: -13 + x = 13.341664064 Solving -13 + x = 13.341664064 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 = 13.341664064 + 13 Combine like terms: -13 + 13 = 0 0 + x = 13.341664064 + 13 x = 13.341664064 + 13 Combine like terms: 13.341664064 + 13 = 26.341664064 x = 26.341664064 Simplifying x = 26.341664064

Subproblem 2

x + -13 = -13.341664064 Simplifying x + -13 = -13.341664064 Reorder the terms: -13 + x = -13.341664064 Solving -13 + x = -13.341664064 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 = -13.341664064 + 13 Combine like terms: -13 + 13 = 0 0 + x = -13.341664064 + 13 x = -13.341664064 + 13 Combine like terms: -13.341664064 + 13 = -0.341664064 x = -0.341664064 Simplifying x = -0.341664064

Solution

The solution to the problem is based on the solutions from the subproblems. x = {26.341664064, -0.341664064}

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