u^2-8u-57=0

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Solution for u^2-8u-57=0 equation:


Simplifying
u2 + -8u + -57 = 0

Reorder the terms:
-57 + -8u + u2 = 0

Solving
-57 + -8u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '57' to each side of the equation.
-57 + -8u + 57 + u2 = 0 + 57

Reorder the terms:
-57 + 57 + -8u + u2 = 0 + 57

Combine like terms: -57 + 57 = 0
0 + -8u + u2 = 0 + 57
-8u + u2 = 0 + 57

Combine like terms: 0 + 57 = 57
-8u + u2 = 57

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 = 57 + 16

Reorder the terms:
16 + -8u + u2 = 57 + 16

Combine like terms: 57 + 16 = 73
16 + -8u + u2 = 73

Factor a perfect square on the left side:
(u + -4)(u + -4) = 73

Calculate the square root of the right side: 8.544003745

Break this problem into two subproblems by setting 
(u + -4) equal to 8.544003745 and -8.544003745.

Subproblem 1

u + -4 = 8.544003745 Simplifying u + -4 = 8.544003745 Reorder the terms: -4 + u = 8.544003745 Solving -4 + u = 8.544003745 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 = 8.544003745 + 4 Combine like terms: -4 + 4 = 0 0 + u = 8.544003745 + 4 u = 8.544003745 + 4 Combine like terms: 8.544003745 + 4 = 12.544003745 u = 12.544003745 Simplifying u = 12.544003745

Subproblem 2

u + -4 = -8.544003745 Simplifying u + -4 = -8.544003745 Reorder the terms: -4 + u = -8.544003745 Solving -4 + u = -8.544003745 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 = -8.544003745 + 4 Combine like terms: -4 + 4 = 0 0 + u = -8.544003745 + 4 u = -8.544003745 + 4 Combine like terms: -8.544003745 + 4 = -4.544003745 u = -4.544003745 Simplifying u = -4.544003745

Solution

The solution to the problem is based on the solutions from the subproblems. u = {12.544003745, -4.544003745}

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