0=u^2+8u-8

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Solution for 0=u^2+8u-8 equation:


Simplifying
0 = u2 + 8u + -8

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

Solving
0 = -8 + 8u + u2

Solving for variable 'u'.

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

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

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

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

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

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-8 + 8u + u2 = 0

Move the constant term to the right:

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

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

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

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

The u term is 8u.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8u + 16 + u2 = 8 + 16

Reorder the terms:
16 + 8u + u2 = 8 + 16

Combine like terms: 8 + 16 = 24
16 + 8u + u2 = 24

Factor a perfect square on the left side:
(u + 4)(u + 4) = 24

Calculate the square root of the right side: 4.898979486

Break this problem into two subproblems by setting 
(u + 4) equal to 4.898979486 and -4.898979486.

Subproblem 1

u + 4 = 4.898979486 Simplifying u + 4 = 4.898979486 Reorder the terms: 4 + u = 4.898979486 Solving 4 + u = 4.898979486 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + u = 4.898979486 + -4 Combine like terms: 4 + -4 = 0 0 + u = 4.898979486 + -4 u = 4.898979486 + -4 Combine like terms: 4.898979486 + -4 = 0.898979486 u = 0.898979486 Simplifying u = 0.898979486

Subproblem 2

u + 4 = -4.898979486 Simplifying u + 4 = -4.898979486 Reorder the terms: 4 + u = -4.898979486 Solving 4 + u = -4.898979486 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + u = -4.898979486 + -4 Combine like terms: 4 + -4 = 0 0 + u = -4.898979486 + -4 u = -4.898979486 + -4 Combine like terms: -4.898979486 + -4 = -8.898979486 u = -8.898979486 Simplifying u = -8.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.898979486, -8.898979486}

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