2u^2+17u+23=0

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Solution for 2u^2+17u+23=0 equation:


Simplifying
2u2 + 17u + 23 = 0

Reorder the terms:
23 + 17u + 2u2 = 0

Solving
23 + 17u + 2u2 = 0

Solving for variable 'u'.

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

Divide each side by '2'.
11.5 + 8.5u + u2 = 0

Move the constant term to the right:

Add '-11.5' to each side of the equation.
11.5 + 8.5u + -11.5 + u2 = 0 + -11.5

Reorder the terms:
11.5 + -11.5 + 8.5u + u2 = 0 + -11.5

Combine like terms: 11.5 + -11.5 = 0.0
0.0 + 8.5u + u2 = 0 + -11.5
8.5u + u2 = 0 + -11.5

Combine like terms: 0 + -11.5 = -11.5
8.5u + u2 = -11.5

The u term is 8.5u.  Take half its coefficient (4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
8.5u + 18.0625 + u2 = -11.5 + 18.0625

Reorder the terms:
18.0625 + 8.5u + u2 = -11.5 + 18.0625

Combine like terms: -11.5 + 18.0625 = 6.5625
18.0625 + 8.5u + u2 = 6.5625

Factor a perfect square on the left side:
(u + 4.25)(u + 4.25) = 6.5625

Calculate the square root of the right side: 2.561737691

Break this problem into two subproblems by setting 
(u + 4.25) equal to 2.561737691 and -2.561737691.

Subproblem 1

u + 4.25 = 2.561737691 Simplifying u + 4.25 = 2.561737691 Reorder the terms: 4.25 + u = 2.561737691 Solving 4.25 + u = 2.561737691 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + u = 2.561737691 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + u = 2.561737691 + -4.25 u = 2.561737691 + -4.25 Combine like terms: 2.561737691 + -4.25 = -1.688262309 u = -1.688262309 Simplifying u = -1.688262309

Subproblem 2

u + 4.25 = -2.561737691 Simplifying u + 4.25 = -2.561737691 Reorder the terms: 4.25 + u = -2.561737691 Solving 4.25 + u = -2.561737691 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + u = -2.561737691 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + u = -2.561737691 + -4.25 u = -2.561737691 + -4.25 Combine like terms: -2.561737691 + -4.25 = -6.811737691 u = -6.811737691 Simplifying u = -6.811737691

Solution

The solution to the problem is based on the solutions from the subproblems. u = {-1.688262309, -6.811737691}

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