y^2-8y-24=0

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Solution for y^2-8y-24=0 equation:


Simplifying
y2 + -8y + -24 = 0

Reorder the terms:
-24 + -8y + y2 = 0

Solving
-24 + -8y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -8y + 24 + y2 = 0 + 24

Reorder the terms:
-24 + 24 + -8y + y2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -8y + y2 = 0 + 24
-8y + y2 = 0 + 24

Combine like terms: 0 + 24 = 24
-8y + y2 = 24

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 = 24 + 16

Reorder the terms:
16 + -8y + y2 = 24 + 16

Combine like terms: 24 + 16 = 40
16 + -8y + y2 = 40

Factor a perfect square on the left side:
(y + -4)(y + -4) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(y + -4) equal to 6.32455532 and -6.32455532.

Subproblem 1

y + -4 = 6.32455532 Simplifying y + -4 = 6.32455532 Reorder the terms: -4 + y = 6.32455532 Solving -4 + y = 6.32455532 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 = 6.32455532 + 4 Combine like terms: -4 + 4 = 0 0 + y = 6.32455532 + 4 y = 6.32455532 + 4 Combine like terms: 6.32455532 + 4 = 10.32455532 y = 10.32455532 Simplifying y = 10.32455532

Subproblem 2

y + -4 = -6.32455532 Simplifying y + -4 = -6.32455532 Reorder the terms: -4 + y = -6.32455532 Solving -4 + y = -6.32455532 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 = -6.32455532 + 4 Combine like terms: -4 + 4 = 0 0 + y = -6.32455532 + 4 y = -6.32455532 + 4 Combine like terms: -6.32455532 + 4 = -2.32455532 y = -2.32455532 Simplifying y = -2.32455532

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.32455532, -2.32455532}

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