-u^2+9u+26=0

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


Simplifying
-1u2 + 9u + 26 = 0

Reorder the terms:
26 + 9u + -1u2 = 0

Solving
26 + 9u + -1u2 = 0

Solving for variable 'u'.

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

Divide each side by '-1'.
-26 + -9u + u2 = 0

Move the constant term to the right:

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

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

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

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

The u term is -9u.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9u + 20.25 + u2 = 26 + 20.25

Reorder the terms:
20.25 + -9u + u2 = 26 + 20.25

Combine like terms: 26 + 20.25 = 46.25
20.25 + -9u + u2 = 46.25

Factor a perfect square on the left side:
(u + -4.5)(u + -4.5) = 46.25

Calculate the square root of the right side: 6.800735254

Break this problem into two subproblems by setting 
(u + -4.5) equal to 6.800735254 and -6.800735254.

Subproblem 1

u + -4.5 = 6.800735254 Simplifying u + -4.5 = 6.800735254 Reorder the terms: -4.5 + u = 6.800735254 Solving -4.5 + u = 6.800735254 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + u = 6.800735254 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + u = 6.800735254 + 4.5 u = 6.800735254 + 4.5 Combine like terms: 6.800735254 + 4.5 = 11.300735254 u = 11.300735254 Simplifying u = 11.300735254

Subproblem 2

u + -4.5 = -6.800735254 Simplifying u + -4.5 = -6.800735254 Reorder the terms: -4.5 + u = -6.800735254 Solving -4.5 + u = -6.800735254 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + u = -6.800735254 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + u = -6.800735254 + 4.5 u = -6.800735254 + 4.5 Combine like terms: -6.800735254 + 4.5 = -2.300735254 u = -2.300735254 Simplifying u = -2.300735254

Solution

The solution to the problem is based on the solutions from the subproblems. u = {11.300735254, -2.300735254}

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