y^2-16y=55

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Solution for y^2-16y=55 equation:


Simplifying
y2 + -16y = 55

Reorder the terms:
-16y + y2 = 55

Solving
-16y + y2 = 55

Solving for variable 'y'.

Reorder the terms:
-55 + -16y + y2 = 55 + -55

Combine like terms: 55 + -55 = 0
-55 + -16y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + -16y + 55 + y2 = 0 + 55

Reorder the terms:
-55 + 55 + -16y + y2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + -16y + y2 = 0 + 55
-16y + y2 = 0 + 55

Combine like terms: 0 + 55 = 55
-16y + y2 = 55

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 = 55 + 64

Reorder the terms:
64 + -16y + y2 = 55 + 64

Combine like terms: 55 + 64 = 119
64 + -16y + y2 = 119

Factor a perfect square on the left side:
(y + -8)(y + -8) = 119

Calculate the square root of the right side: 10.908712115

Break this problem into two subproblems by setting 
(y + -8) equal to 10.908712115 and -10.908712115.

Subproblem 1

y + -8 = 10.908712115 Simplifying y + -8 = 10.908712115 Reorder the terms: -8 + y = 10.908712115 Solving -8 + y = 10.908712115 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 = 10.908712115 + 8 Combine like terms: -8 + 8 = 0 0 + y = 10.908712115 + 8 y = 10.908712115 + 8 Combine like terms: 10.908712115 + 8 = 18.908712115 y = 18.908712115 Simplifying y = 18.908712115

Subproblem 2

y + -8 = -10.908712115 Simplifying y + -8 = -10.908712115 Reorder the terms: -8 + y = -10.908712115 Solving -8 + y = -10.908712115 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 = -10.908712115 + 8 Combine like terms: -8 + 8 = 0 0 + y = -10.908712115 + 8 y = -10.908712115 + 8 Combine like terms: -10.908712115 + 8 = -2.908712115 y = -2.908712115 Simplifying y = -2.908712115

Solution

The solution to the problem is based on the solutions from the subproblems. y = {18.908712115, -2.908712115}

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