u^2+16u+36=0

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Solution for u^2+16u+36=0 equation:


Simplifying
u2 + 16u + 36 = 0

Reorder the terms:
36 + 16u + u2 = 0

Solving
36 + 16u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '-36' to each side of the equation.
36 + 16u + -36 + u2 = 0 + -36

Reorder the terms:
36 + -36 + 16u + u2 = 0 + -36

Combine like terms: 36 + -36 = 0
0 + 16u + u2 = 0 + -36
16u + u2 = 0 + -36

Combine like terms: 0 + -36 = -36
16u + u2 = -36

The u term is 16u.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16u + 64 + u2 = -36 + 64

Reorder the terms:
64 + 16u + u2 = -36 + 64

Combine like terms: -36 + 64 = 28
64 + 16u + u2 = 28

Factor a perfect square on the left side:
(u + 8)(u + 8) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(u + 8) equal to 5.291502622 and -5.291502622.

Subproblem 1

u + 8 = 5.291502622 Simplifying u + 8 = 5.291502622 Reorder the terms: 8 + u = 5.291502622 Solving 8 + u = 5.291502622 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + u = 5.291502622 + -8 Combine like terms: 8 + -8 = 0 0 + u = 5.291502622 + -8 u = 5.291502622 + -8 Combine like terms: 5.291502622 + -8 = -2.708497378 u = -2.708497378 Simplifying u = -2.708497378

Subproblem 2

u + 8 = -5.291502622 Simplifying u + 8 = -5.291502622 Reorder the terms: 8 + u = -5.291502622 Solving 8 + u = -5.291502622 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + u = -5.291502622 + -8 Combine like terms: 8 + -8 = 0 0 + u = -5.291502622 + -8 u = -5.291502622 + -8 Combine like terms: -5.291502622 + -8 = -13.291502622 u = -13.291502622 Simplifying u = -13.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. u = {-2.708497378, -13.291502622}

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