0=y^2-8y-160

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Solution for 0=y^2-8y-160 equation:


Simplifying
0 = y2 + -8y + -160

Reorder the terms:
0 = -160 + -8y + y2

Solving
0 = -160 + -8y + y2

Solving for variable 'y'.

Combine like terms: 0 + 160 = 160
160 + 8y + -1y2 = -160 + -8y + y2 + 160 + 8y + -1y2

Reorder the terms:
160 + 8y + -1y2 = -160 + 160 + -8y + 8y + y2 + -1y2

Combine like terms: -160 + 160 = 0
160 + 8y + -1y2 = 0 + -8y + 8y + y2 + -1y2
160 + 8y + -1y2 = -8y + 8y + y2 + -1y2

Combine like terms: -8y + 8y = 0
160 + 8y + -1y2 = 0 + y2 + -1y2
160 + 8y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
160 + 8y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-160 + -8y + y2 = 0

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + -8y + 160 + y2 = 0 + 160

Reorder the terms:
-160 + 160 + -8y + y2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + -8y + y2 = 0 + 160
-8y + y2 = 0 + 160

Combine like terms: 0 + 160 = 160
-8y + y2 = 160

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 = 160 + 16

Reorder the terms:
16 + -8y + y2 = 160 + 16

Combine like terms: 160 + 16 = 176
16 + -8y + y2 = 176

Factor a perfect square on the left side:
(y + -4)(y + -4) = 176

Calculate the square root of the right side: 13.266499161

Break this problem into two subproblems by setting 
(y + -4) equal to 13.266499161 and -13.266499161.

Subproblem 1

y + -4 = 13.266499161 Simplifying y + -4 = 13.266499161 Reorder the terms: -4 + y = 13.266499161 Solving -4 + y = 13.266499161 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 = 13.266499161 + 4 Combine like terms: -4 + 4 = 0 0 + y = 13.266499161 + 4 y = 13.266499161 + 4 Combine like terms: 13.266499161 + 4 = 17.266499161 y = 17.266499161 Simplifying y = 17.266499161

Subproblem 2

y + -4 = -13.266499161 Simplifying y + -4 = -13.266499161 Reorder the terms: -4 + y = -13.266499161 Solving -4 + y = -13.266499161 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 = -13.266499161 + 4 Combine like terms: -4 + 4 = 0 0 + y = -13.266499161 + 4 y = -13.266499161 + 4 Combine like terms: -13.266499161 + 4 = -9.266499161 y = -9.266499161 Simplifying y = -9.266499161

Solution

The solution to the problem is based on the solutions from the subproblems. y = {17.266499161, -9.266499161}

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