u^2+8u-27=0

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Solution for u^2+8u-27=0 equation:


Simplifying
u2 + 8u + -27 = 0

Reorder the terms:
-27 + 8u + u2 = 0

Solving
-27 + 8u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + 8u + 27 + u2 = 0 + 27

Reorder the terms:
-27 + 27 + 8u + u2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + 8u + u2 = 0 + 27
8u + u2 = 0 + 27

Combine like terms: 0 + 27 = 27
8u + u2 = 27

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 = 27 + 16

Reorder the terms:
16 + 8u + u2 = 27 + 16

Combine like terms: 27 + 16 = 43
16 + 8u + u2 = 43

Factor a perfect square on the left side:
(u + 4)(u + 4) = 43

Calculate the square root of the right side: 6.557438524

Break this problem into two subproblems by setting 
(u + 4) equal to 6.557438524 and -6.557438524.

Subproblem 1

u + 4 = 6.557438524 Simplifying u + 4 = 6.557438524 Reorder the terms: 4 + u = 6.557438524 Solving 4 + u = 6.557438524 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 = 6.557438524 + -4 Combine like terms: 4 + -4 = 0 0 + u = 6.557438524 + -4 u = 6.557438524 + -4 Combine like terms: 6.557438524 + -4 = 2.557438524 u = 2.557438524 Simplifying u = 2.557438524

Subproblem 2

u + 4 = -6.557438524 Simplifying u + 4 = -6.557438524 Reorder the terms: 4 + u = -6.557438524 Solving 4 + u = -6.557438524 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 = -6.557438524 + -4 Combine like terms: 4 + -4 = 0 0 + u = -6.557438524 + -4 u = -6.557438524 + -4 Combine like terms: -6.557438524 + -4 = -10.557438524 u = -10.557438524 Simplifying u = -10.557438524

Solution

The solution to the problem is based on the solutions from the subproblems. u = {2.557438524, -10.557438524}

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