y^2-8y-16=-7y+88

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Solution for y^2-8y-16=-7y+88 equation:


Simplifying
y2 + -8y + -16 = -7y + 88

Reorder the terms:
-16 + -8y + y2 = -7y + 88

Reorder the terms:
-16 + -8y + y2 = 88 + -7y

Solving
-16 + -8y + y2 = 88 + -7y

Solving for variable 'y'.

Reorder the terms:
-16 + -88 + -8y + 7y + y2 = 88 + -7y + -88 + 7y

Combine like terms: -16 + -88 = -104
-104 + -8y + 7y + y2 = 88 + -7y + -88 + 7y

Combine like terms: -8y + 7y = -1y
-104 + -1y + y2 = 88 + -7y + -88 + 7y

Reorder the terms:
-104 + -1y + y2 = 88 + -88 + -7y + 7y

Combine like terms: 88 + -88 = 0
-104 + -1y + y2 = 0 + -7y + 7y
-104 + -1y + y2 = -7y + 7y

Combine like terms: -7y + 7y = 0
-104 + -1y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '104' to each side of the equation.
-104 + -1y + 104 + y2 = 0 + 104

Reorder the terms:
-104 + 104 + -1y + y2 = 0 + 104

Combine like terms: -104 + 104 = 0
0 + -1y + y2 = 0 + 104
-1y + y2 = 0 + 104

Combine like terms: 0 + 104 = 104
-1y + y2 = 104

The y term is -1y.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1y + 0.25 + y2 = 104 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 104 + 0.25

Combine like terms: 104 + 0.25 = 104.25
0.25 + -1y + y2 = 104.25

Factor a perfect square on the left side:
(y + -0.5)(y + -0.5) = 104.25

Calculate the square root of the right side: 10.210288928

Break this problem into two subproblems by setting 
(y + -0.5) equal to 10.210288928 and -10.210288928.

Subproblem 1

y + -0.5 = 10.210288928 Simplifying y + -0.5 = 10.210288928 Reorder the terms: -0.5 + y = 10.210288928 Solving -0.5 + y = 10.210288928 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = 10.210288928 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 10.210288928 + 0.5 y = 10.210288928 + 0.5 Combine like terms: 10.210288928 + 0.5 = 10.710288928 y = 10.710288928 Simplifying y = 10.710288928

Subproblem 2

y + -0.5 = -10.210288928 Simplifying y + -0.5 = -10.210288928 Reorder the terms: -0.5 + y = -10.210288928 Solving -0.5 + y = -10.210288928 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = -10.210288928 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -10.210288928 + 0.5 y = -10.210288928 + 0.5 Combine like terms: -10.210288928 + 0.5 = -9.710288928 y = -9.710288928 Simplifying y = -9.710288928

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.710288928, -9.710288928}

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