u^2-26u-9=0

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Solution for u^2-26u-9=0 equation:


Simplifying
u2 + -26u + -9 = 0

Reorder the terms:
-9 + -26u + u2 = 0

Solving
-9 + -26u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -26u + 9 + u2 = 0 + 9

Reorder the terms:
-9 + 9 + -26u + u2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -26u + u2 = 0 + 9
-26u + u2 = 0 + 9

Combine like terms: 0 + 9 = 9
-26u + u2 = 9

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

Add '169' to each side of the equation.
-26u + 169 + u2 = 9 + 169

Reorder the terms:
169 + -26u + u2 = 9 + 169

Combine like terms: 9 + 169 = 178
169 + -26u + u2 = 178

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

Calculate the square root of the right side: 13.341664064

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

Subproblem 1

u + -13 = 13.341664064 Simplifying u + -13 = 13.341664064 Reorder the terms: -13 + u = 13.341664064 Solving -13 + u = 13.341664064 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + u = 13.341664064 + 13 Combine like terms: -13 + 13 = 0 0 + u = 13.341664064 + 13 u = 13.341664064 + 13 Combine like terms: 13.341664064 + 13 = 26.341664064 u = 26.341664064 Simplifying u = 26.341664064

Subproblem 2

u + -13 = -13.341664064 Simplifying u + -13 = -13.341664064 Reorder the terms: -13 + u = -13.341664064 Solving -13 + u = -13.341664064 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + u = -13.341664064 + 13 Combine like terms: -13 + 13 = 0 0 + u = -13.341664064 + 13 u = -13.341664064 + 13 Combine like terms: -13.341664064 + 13 = -0.341664064 u = -0.341664064 Simplifying u = -0.341664064

Solution

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

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