y^2-8y-152=0

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Solution for y^2-8y-152=0 equation:


Simplifying
y2 + -8y + -152 = 0

Reorder the terms:
-152 + -8y + y2 = 0

Solving
-152 + -8y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '152' to each side of the equation.
-152 + -8y + 152 + y2 = 0 + 152

Reorder the terms:
-152 + 152 + -8y + y2 = 0 + 152

Combine like terms: -152 + 152 = 0
0 + -8y + y2 = 0 + 152
-8y + y2 = 0 + 152

Combine like terms: 0 + 152 = 152
-8y + y2 = 152

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 = 152 + 16

Reorder the terms:
16 + -8y + y2 = 152 + 16

Combine like terms: 152 + 16 = 168
16 + -8y + y2 = 168

Factor a perfect square on the left side:
(y + -4)(y + -4) = 168

Calculate the square root of the right side: 12.961481397

Break this problem into two subproblems by setting 
(y + -4) equal to 12.961481397 and -12.961481397.

Subproblem 1

y + -4 = 12.961481397 Simplifying y + -4 = 12.961481397 Reorder the terms: -4 + y = 12.961481397 Solving -4 + y = 12.961481397 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 = 12.961481397 + 4 Combine like terms: -4 + 4 = 0 0 + y = 12.961481397 + 4 y = 12.961481397 + 4 Combine like terms: 12.961481397 + 4 = 16.961481397 y = 16.961481397 Simplifying y = 16.961481397

Subproblem 2

y + -4 = -12.961481397 Simplifying y + -4 = -12.961481397 Reorder the terms: -4 + y = -12.961481397 Solving -4 + y = -12.961481397 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 = -12.961481397 + 4 Combine like terms: -4 + 4 = 0 0 + y = -12.961481397 + 4 y = -12.961481397 + 4 Combine like terms: -12.961481397 + 4 = -8.961481397 y = -8.961481397 Simplifying y = -8.961481397

Solution

The solution to the problem is based on the solutions from the subproblems. y = {16.961481397, -8.961481397}

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