y^2-4y=161

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Solution for y^2-4y=161 equation:


Simplifying
y2 + -4y = 161

Reorder the terms:
-4y + y2 = 161

Solving
-4y + y2 = 161

Solving for variable 'y'.

Reorder the terms:
-161 + -4y + y2 = 161 + -161

Combine like terms: 161 + -161 = 0
-161 + -4y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '161' to each side of the equation.
-161 + -4y + 161 + y2 = 0 + 161

Reorder the terms:
-161 + 161 + -4y + y2 = 0 + 161

Combine like terms: -161 + 161 = 0
0 + -4y + y2 = 0 + 161
-4y + y2 = 0 + 161

Combine like terms: 0 + 161 = 161
-4y + y2 = 161

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = 161 + 4

Reorder the terms:
4 + -4y + y2 = 161 + 4

Combine like terms: 161 + 4 = 165
4 + -4y + y2 = 165

Factor a perfect square on the left side:
(y + -2)(y + -2) = 165

Calculate the square root of the right side: 12.845232579

Break this problem into two subproblems by setting 
(y + -2) equal to 12.845232579 and -12.845232579.

Subproblem 1

y + -2 = 12.845232579 Simplifying y + -2 = 12.845232579 Reorder the terms: -2 + y = 12.845232579 Solving -2 + y = 12.845232579 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = 12.845232579 + 2 Combine like terms: -2 + 2 = 0 0 + y = 12.845232579 + 2 y = 12.845232579 + 2 Combine like terms: 12.845232579 + 2 = 14.845232579 y = 14.845232579 Simplifying y = 14.845232579

Subproblem 2

y + -2 = -12.845232579 Simplifying y + -2 = -12.845232579 Reorder the terms: -2 + y = -12.845232579 Solving -2 + y = -12.845232579 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = -12.845232579 + 2 Combine like terms: -2 + 2 = 0 0 + y = -12.845232579 + 2 y = -12.845232579 + 2 Combine like terms: -12.845232579 + 2 = -10.845232579 y = -10.845232579 Simplifying y = -10.845232579

Solution

The solution to the problem is based on the solutions from the subproblems. y = {14.845232579, -10.845232579}

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