u^2+11u+15=0

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Solution for u^2+11u+15=0 equation:


Simplifying
u2 + 11u + 15 = 0

Reorder the terms:
15 + 11u + u2 = 0

Solving
15 + 11u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + 11u + -15 + u2 = 0 + -15

Reorder the terms:
15 + -15 + 11u + u2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 11u + u2 = 0 + -15
11u + u2 = 0 + -15

Combine like terms: 0 + -15 = -15
11u + u2 = -15

The u term is 11u.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11u + 30.25 + u2 = -15 + 30.25

Reorder the terms:
30.25 + 11u + u2 = -15 + 30.25

Combine like terms: -15 + 30.25 = 15.25
30.25 + 11u + u2 = 15.25

Factor a perfect square on the left side:
(u + 5.5)(u + 5.5) = 15.25

Calculate the square root of the right side: 3.905124838

Break this problem into two subproblems by setting 
(u + 5.5) equal to 3.905124838 and -3.905124838.

Subproblem 1

u + 5.5 = 3.905124838 Simplifying u + 5.5 = 3.905124838 Reorder the terms: 5.5 + u = 3.905124838 Solving 5.5 + u = 3.905124838 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + u = 3.905124838 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + u = 3.905124838 + -5.5 u = 3.905124838 + -5.5 Combine like terms: 3.905124838 + -5.5 = -1.594875162 u = -1.594875162 Simplifying u = -1.594875162

Subproblem 2

u + 5.5 = -3.905124838 Simplifying u + 5.5 = -3.905124838 Reorder the terms: 5.5 + u = -3.905124838 Solving 5.5 + u = -3.905124838 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + u = -3.905124838 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + u = -3.905124838 + -5.5 u = -3.905124838 + -5.5 Combine like terms: -3.905124838 + -5.5 = -9.405124838 u = -9.405124838 Simplifying u = -9.405124838

Solution

The solution to the problem is based on the solutions from the subproblems. u = {-1.594875162, -9.405124838}

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