y^2-y-164=0

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Solution for y^2-y-164=0 equation:


Simplifying
y2 + -1y + -164 = 0

Reorder the terms:
-164 + -1y + y2 = 0

Solving
-164 + -1y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '164' to each side of the equation.
-164 + -1y + 164 + y2 = 0 + 164

Reorder the terms:
-164 + 164 + -1y + y2 = 0 + 164

Combine like terms: -164 + 164 = 0
0 + -1y + y2 = 0 + 164
-1y + y2 = 0 + 164

Combine like terms: 0 + 164 = 164
-1y + y2 = 164

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 = 164 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 164 + 0.25

Combine like terms: 164 + 0.25 = 164.25
0.25 + -1y + y2 = 164.25

Factor a perfect square on the left side:
(y + -0.5)(y + -0.5) = 164.25

Calculate the square root of the right side: 12.816005618

Break this problem into two subproblems by setting 
(y + -0.5) equal to 12.816005618 and -12.816005618.

Subproblem 1

y + -0.5 = 12.816005618 Simplifying y + -0.5 = 12.816005618 Reorder the terms: -0.5 + y = 12.816005618 Solving -0.5 + y = 12.816005618 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 = 12.816005618 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 12.816005618 + 0.5 y = 12.816005618 + 0.5 Combine like terms: 12.816005618 + 0.5 = 13.316005618 y = 13.316005618 Simplifying y = 13.316005618

Subproblem 2

y + -0.5 = -12.816005618 Simplifying y + -0.5 = -12.816005618 Reorder the terms: -0.5 + y = -12.816005618 Solving -0.5 + y = -12.816005618 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 = -12.816005618 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -12.816005618 + 0.5 y = -12.816005618 + 0.5 Combine like terms: -12.816005618 + 0.5 = -12.316005618 y = -12.316005618 Simplifying y = -12.316005618

Solution

The solution to the problem is based on the solutions from the subproblems. y = {13.316005618, -12.316005618}

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