u^2-8u=41

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Solution for u^2-8u=41 equation:


Simplifying
u2 + -8u = 41

Reorder the terms:
-8u + u2 = 41

Solving
-8u + u2 = 41

Solving for variable 'u'.

Reorder the terms:
-41 + -8u + u2 = 41 + -41

Combine like terms: 41 + -41 = 0
-41 + -8u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '41' to each side of the equation.
-41 + -8u + 41 + u2 = 0 + 41

Reorder the terms:
-41 + 41 + -8u + u2 = 0 + 41

Combine like terms: -41 + 41 = 0
0 + -8u + u2 = 0 + 41
-8u + u2 = 0 + 41

Combine like terms: 0 + 41 = 41
-8u + u2 = 41

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 = 41 + 16

Reorder the terms:
16 + -8u + u2 = 41 + 16

Combine like terms: 41 + 16 = 57
16 + -8u + u2 = 57

Factor a perfect square on the left side:
(u + -4)(u + -4) = 57

Calculate the square root of the right side: 7.549834435

Break this problem into two subproblems by setting 
(u + -4) equal to 7.549834435 and -7.549834435.

Subproblem 1

u + -4 = 7.549834435 Simplifying u + -4 = 7.549834435 Reorder the terms: -4 + u = 7.549834435 Solving -4 + u = 7.549834435 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 = 7.549834435 + 4 Combine like terms: -4 + 4 = 0 0 + u = 7.549834435 + 4 u = 7.549834435 + 4 Combine like terms: 7.549834435 + 4 = 11.549834435 u = 11.549834435 Simplifying u = 11.549834435

Subproblem 2

u + -4 = -7.549834435 Simplifying u + -4 = -7.549834435 Reorder the terms: -4 + u = -7.549834435 Solving -4 + u = -7.549834435 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 = -7.549834435 + 4 Combine like terms: -4 + 4 = 0 0 + u = -7.549834435 + 4 u = -7.549834435 + 4 Combine like terms: -7.549834435 + 4 = -3.549834435 u = -3.549834435 Simplifying u = -3.549834435

Solution

The solution to the problem is based on the solutions from the subproblems. u = {11.549834435, -3.549834435}

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