2u^2+12u+17=u^2+9

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Solution for 2u^2+12u+17=u^2+9 equation:


Simplifying
2u2 + 12u + 17 = u2 + 9

Reorder the terms:
17 + 12u + 2u2 = u2 + 9

Reorder the terms:
17 + 12u + 2u2 = 9 + u2

Solving
17 + 12u + 2u2 = 9 + u2

Solving for variable 'u'.

Reorder the terms:
17 + -9 + 12u + 2u2 + -1u2 = 9 + u2 + -9 + -1u2

Combine like terms: 17 + -9 = 8
8 + 12u + 2u2 + -1u2 = 9 + u2 + -9 + -1u2

Combine like terms: 2u2 + -1u2 = 1u2
8 + 12u + 1u2 = 9 + u2 + -9 + -1u2

Reorder the terms:
8 + 12u + 1u2 = 9 + -9 + u2 + -1u2

Combine like terms: 9 + -9 = 0
8 + 12u + 1u2 = 0 + u2 + -1u2
8 + 12u + 1u2 = u2 + -1u2

Combine like terms: u2 + -1u2 = 0
8 + 12u + 1u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + 12u + -8 + u2 = 0 + -8

Reorder the terms:
8 + -8 + 12u + u2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + 12u + u2 = 0 + -8
12u + u2 = 0 + -8

Combine like terms: 0 + -8 = -8
12u + u2 = -8

The u term is 12u.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12u + 36 + u2 = -8 + 36

Reorder the terms:
36 + 12u + u2 = -8 + 36

Combine like terms: -8 + 36 = 28
36 + 12u + u2 = 28

Factor a perfect square on the left side:
(u + 6)(u + 6) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(u + 6) equal to 5.291502622 and -5.291502622.

Subproblem 1

u + 6 = 5.291502622 Simplifying u + 6 = 5.291502622 Reorder the terms: 6 + u = 5.291502622 Solving 6 + u = 5.291502622 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + u = 5.291502622 + -6 Combine like terms: 6 + -6 = 0 0 + u = 5.291502622 + -6 u = 5.291502622 + -6 Combine like terms: 5.291502622 + -6 = -0.708497378 u = -0.708497378 Simplifying u = -0.708497378

Subproblem 2

u + 6 = -5.291502622 Simplifying u + 6 = -5.291502622 Reorder the terms: 6 + u = -5.291502622 Solving 6 + u = -5.291502622 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + u = -5.291502622 + -6 Combine like terms: 6 + -6 = 0 0 + u = -5.291502622 + -6 u = -5.291502622 + -6 Combine like terms: -5.291502622 + -6 = -11.291502622 u = -11.291502622 Simplifying u = -11.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. u = {-0.708497378, -11.291502622}

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