(-2u^2+7u-1)+(4u^2+6u+5)=0

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Solution for (-2u^2+7u-1)+(4u^2+6u+5)=0 equation:


Simplifying
(-2u2 + 7u + -1) + (4u2 + 6u + 5) = 0

Reorder the terms:
(-1 + 7u + -2u2) + (4u2 + 6u + 5) = 0

Remove parenthesis around (-1 + 7u + -2u2)
-1 + 7u + -2u2 + (4u2 + 6u + 5) = 0

Reorder the terms:
-1 + 7u + -2u2 + (5 + 6u + 4u2) = 0

Remove parenthesis around (5 + 6u + 4u2)
-1 + 7u + -2u2 + 5 + 6u + 4u2 = 0

Reorder the terms:
-1 + 5 + 7u + 6u + -2u2 + 4u2 = 0

Combine like terms: -1 + 5 = 4
4 + 7u + 6u + -2u2 + 4u2 = 0

Combine like terms: 7u + 6u = 13u
4 + 13u + -2u2 + 4u2 = 0

Combine like terms: -2u2 + 4u2 = 2u2
4 + 13u + 2u2 = 0

Solving
4 + 13u + 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'.
2 + 6.5u + u2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 6.5u + -2 + u2 = 0 + -2

Reorder the terms:
2 + -2 + 6.5u + u2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 6.5u + u2 = 0 + -2
6.5u + u2 = 0 + -2

Combine like terms: 0 + -2 = -2
6.5u + u2 = -2

The u term is 6.5u.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5u + 10.5625 + u2 = -2 + 10.5625

Reorder the terms:
10.5625 + 6.5u + u2 = -2 + 10.5625

Combine like terms: -2 + 10.5625 = 8.5625
10.5625 + 6.5u + u2 = 8.5625

Factor a perfect square on the left side:
(u + 3.25)(u + 3.25) = 8.5625

Calculate the square root of the right side: 2.926174978

Break this problem into two subproblems by setting 
(u + 3.25) equal to 2.926174978 and -2.926174978.

Subproblem 1

u + 3.25 = 2.926174978 Simplifying u + 3.25 = 2.926174978 Reorder the terms: 3.25 + u = 2.926174978 Solving 3.25 + u = 2.926174978 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + u = 2.926174978 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + u = 2.926174978 + -3.25 u = 2.926174978 + -3.25 Combine like terms: 2.926174978 + -3.25 = -0.323825022 u = -0.323825022 Simplifying u = -0.323825022

Subproblem 2

u + 3.25 = -2.926174978 Simplifying u + 3.25 = -2.926174978 Reorder the terms: 3.25 + u = -2.926174978 Solving 3.25 + u = -2.926174978 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + u = -2.926174978 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + u = -2.926174978 + -3.25 u = -2.926174978 + -3.25 Combine like terms: -2.926174978 + -3.25 = -6.176174978 u = -6.176174978 Simplifying u = -6.176174978

Solution

The solution to the problem is based on the solutions from the subproblems. u = {-0.323825022, -6.176174978}

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