(3u^2-u+4)+(-5u^2+6u+7)=

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Solution for (3u^2-u+4)+(-5u^2+6u+7)= equation:


Simplifying
(3u2 + -1u + 4) + (-5u2 + 6u + 7) = 0

Reorder the terms:
(4 + -1u + 3u2) + (-5u2 + 6u + 7) = 0

Remove parenthesis around (4 + -1u + 3u2)
4 + -1u + 3u2 + (-5u2 + 6u + 7) = 0

Reorder the terms:
4 + -1u + 3u2 + (7 + 6u + -5u2) = 0

Remove parenthesis around (7 + 6u + -5u2)
4 + -1u + 3u2 + 7 + 6u + -5u2 = 0

Reorder the terms:
4 + 7 + -1u + 6u + 3u2 + -5u2 = 0

Combine like terms: 4 + 7 = 11
11 + -1u + 6u + 3u2 + -5u2 = 0

Combine like terms: -1u + 6u = 5u
11 + 5u + 3u2 + -5u2 = 0

Combine like terms: 3u2 + -5u2 = -2u2
11 + 5u + -2u2 = 0

Solving
11 + 5u + -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'.
-5.5 + -2.5u + u2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + -2.5u + 5.5 + u2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + -2.5u + u2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + -2.5u + u2 = 0 + 5.5
-2.5u + u2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
-2.5u + u2 = 5.5

The u term is -2.5u.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5u + 1.5625 + u2 = 5.5 + 1.5625

Reorder the terms:
1.5625 + -2.5u + u2 = 5.5 + 1.5625

Combine like terms: 5.5 + 1.5625 = 7.0625
1.5625 + -2.5u + u2 = 7.0625

Factor a perfect square on the left side:
(u + -1.25)(u + -1.25) = 7.0625

Calculate the square root of the right side: 2.657536453

Break this problem into two subproblems by setting 
(u + -1.25) equal to 2.657536453 and -2.657536453.

Subproblem 1

u + -1.25 = 2.657536453 Simplifying u + -1.25 = 2.657536453 Reorder the terms: -1.25 + u = 2.657536453 Solving -1.25 + u = 2.657536453 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + u = 2.657536453 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + u = 2.657536453 + 1.25 u = 2.657536453 + 1.25 Combine like terms: 2.657536453 + 1.25 = 3.907536453 u = 3.907536453 Simplifying u = 3.907536453

Subproblem 2

u + -1.25 = -2.657536453 Simplifying u + -1.25 = -2.657536453 Reorder the terms: -1.25 + u = -2.657536453 Solving -1.25 + u = -2.657536453 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + u = -2.657536453 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + u = -2.657536453 + 1.25 u = -2.657536453 + 1.25 Combine like terms: -2.657536453 + 1.25 = -1.407536453 u = -1.407536453 Simplifying u = -1.407536453

Solution

The solution to the problem is based on the solutions from the subproblems. u = {3.907536453, -1.407536453}

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