y^2-9y-88=0

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Solution for y^2-9y-88=0 equation:


Simplifying
y2 + -9y + -88 = 0

Reorder the terms:
-88 + -9y + y2 = 0

Solving
-88 + -9y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '88' to each side of the equation.
-88 + -9y + 88 + y2 = 0 + 88

Reorder the terms:
-88 + 88 + -9y + y2 = 0 + 88

Combine like terms: -88 + 88 = 0
0 + -9y + y2 = 0 + 88
-9y + y2 = 0 + 88

Combine like terms: 0 + 88 = 88
-9y + y2 = 88

The y term is -9y.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9y + 20.25 + y2 = 88 + 20.25

Reorder the terms:
20.25 + -9y + y2 = 88 + 20.25

Combine like terms: 88 + 20.25 = 108.25
20.25 + -9y + y2 = 108.25

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = 108.25

Calculate the square root of the right side: 10.404326023

Break this problem into two subproblems by setting 
(y + -4.5) equal to 10.404326023 and -10.404326023.

Subproblem 1

y + -4.5 = 10.404326023 Simplifying y + -4.5 = 10.404326023 Reorder the terms: -4.5 + y = 10.404326023 Solving -4.5 + y = 10.404326023 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = 10.404326023 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 10.404326023 + 4.5 y = 10.404326023 + 4.5 Combine like terms: 10.404326023 + 4.5 = 14.904326023 y = 14.904326023 Simplifying y = 14.904326023

Subproblem 2

y + -4.5 = -10.404326023 Simplifying y + -4.5 = -10.404326023 Reorder the terms: -4.5 + y = -10.404326023 Solving -4.5 + y = -10.404326023 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = -10.404326023 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = -10.404326023 + 4.5 y = -10.404326023 + 4.5 Combine like terms: -10.404326023 + 4.5 = -5.904326023 y = -5.904326023 Simplifying y = -5.904326023

Solution

The solution to the problem is based on the solutions from the subproblems. y = {14.904326023, -5.904326023}

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