y^2-16y-64=0

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Solution for y^2-16y-64=0 equation:


Simplifying
y2 + -16y + -64 = 0

Reorder the terms:
-64 + -16y + y2 = 0

Solving
-64 + -16y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -16y + 64 + y2 = 0 + 64

Reorder the terms:
-64 + 64 + -16y + y2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -16y + y2 = 0 + 64
-16y + y2 = 0 + 64

Combine like terms: 0 + 64 = 64
-16y + y2 = 64

The y term is -16y.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16y + 64 + y2 = 64 + 64

Reorder the terms:
64 + -16y + y2 = 64 + 64

Combine like terms: 64 + 64 = 128
64 + -16y + y2 = 128

Factor a perfect square on the left side:
(y + -8)(y + -8) = 128

Calculate the square root of the right side: 11.313708499

Break this problem into two subproblems by setting 
(y + -8) equal to 11.313708499 and -11.313708499.

Subproblem 1

y + -8 = 11.313708499 Simplifying y + -8 = 11.313708499 Reorder the terms: -8 + y = 11.313708499 Solving -8 + y = 11.313708499 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + y = 11.313708499 + 8 Combine like terms: -8 + 8 = 0 0 + y = 11.313708499 + 8 y = 11.313708499 + 8 Combine like terms: 11.313708499 + 8 = 19.313708499 y = 19.313708499 Simplifying y = 19.313708499

Subproblem 2

y + -8 = -11.313708499 Simplifying y + -8 = -11.313708499 Reorder the terms: -8 + y = -11.313708499 Solving -8 + y = -11.313708499 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + y = -11.313708499 + 8 Combine like terms: -8 + 8 = 0 0 + y = -11.313708499 + 8 y = -11.313708499 + 8 Combine like terms: -11.313708499 + 8 = -3.313708499 y = -3.313708499 Simplifying y = -3.313708499

Solution

The solution to the problem is based on the solutions from the subproblems. y = {19.313708499, -3.313708499}

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