y^2+8y-27=0

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


Simplifying
y2 + 8y + -27 = 0

Reorder the terms:
-27 + 8y + y2 = 0

Solving
-27 + 8y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + 8y + 27 + y2 = 0 + 27

Reorder the terms:
-27 + 27 + 8y + y2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + 8y + y2 = 0 + 27
8y + y2 = 0 + 27

Combine like terms: 0 + 27 = 27
8y + y2 = 27

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

Add '16' to each side of the equation.
8y + 16 + y2 = 27 + 16

Reorder the terms:
16 + 8y + y2 = 27 + 16

Combine like terms: 27 + 16 = 43
16 + 8y + y2 = 43

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

Calculate the square root of the right side: 6.557438524

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

Subproblem 1

y + 4 = 6.557438524 Simplifying y + 4 = 6.557438524 Reorder the terms: 4 + y = 6.557438524 Solving 4 + y = 6.557438524 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + y = 6.557438524 + -4 Combine like terms: 4 + -4 = 0 0 + y = 6.557438524 + -4 y = 6.557438524 + -4 Combine like terms: 6.557438524 + -4 = 2.557438524 y = 2.557438524 Simplifying y = 2.557438524

Subproblem 2

y + 4 = -6.557438524 Simplifying y + 4 = -6.557438524 Reorder the terms: 4 + y = -6.557438524 Solving 4 + y = -6.557438524 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + y = -6.557438524 + -4 Combine like terms: 4 + -4 = 0 0 + y = -6.557438524 + -4 y = -6.557438524 + -4 Combine like terms: -6.557438524 + -4 = -10.557438524 y = -10.557438524 Simplifying y = -10.557438524

Solution

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

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