8u=-u^2+1

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Solution for 8u=-u^2+1 equation:


Simplifying
8u = -1u2 + 1

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

Solving
8u = 1 + -1u2

Solving for variable 'u'.

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

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

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

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

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 8u + 1 + u2 = 0 + 1

Reorder the terms:
-1 + 1 + 8u + u2 = 0 + 1

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

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

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 = 1 + 16

Reorder the terms:
16 + 8u + u2 = 1 + 16

Combine like terms: 1 + 16 = 17
16 + 8u + u2 = 17

Factor a perfect square on the left side:
(u + 4)(u + 4) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(u + 4) equal to 4.123105626 and -4.123105626.

Subproblem 1

u + 4 = 4.123105626 Simplifying u + 4 = 4.123105626 Reorder the terms: 4 + u = 4.123105626 Solving 4 + u = 4.123105626 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 = 4.123105626 + -4 Combine like terms: 4 + -4 = 0 0 + u = 4.123105626 + -4 u = 4.123105626 + -4 Combine like terms: 4.123105626 + -4 = 0.123105626 u = 0.123105626 Simplifying u = 0.123105626

Subproblem 2

u + 4 = -4.123105626 Simplifying u + 4 = -4.123105626 Reorder the terms: 4 + u = -4.123105626 Solving 4 + u = -4.123105626 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 = -4.123105626 + -4 Combine like terms: 4 + -4 = 0 0 + u = -4.123105626 + -4 u = -4.123105626 + -4 Combine like terms: -4.123105626 + -4 = -8.123105626 u = -8.123105626 Simplifying u = -8.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.123105626, -8.123105626}

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