y^2=4y+171

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Solution for y^2=4y+171 equation:


Simplifying
y2 = 4y + 171

Reorder the terms:
y2 = 171 + 4y

Solving
y2 = 171 + 4y

Solving for variable 'y'.

Reorder the terms:
-171 + -4y + y2 = 171 + 4y + -171 + -4y

Reorder the terms:
-171 + -4y + y2 = 171 + -171 + 4y + -4y

Combine like terms: 171 + -171 = 0
-171 + -4y + y2 = 0 + 4y + -4y
-171 + -4y + y2 = 4y + -4y

Combine like terms: 4y + -4y = 0
-171 + -4y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '171' to each side of the equation.
-171 + -4y + 171 + y2 = 0 + 171

Reorder the terms:
-171 + 171 + -4y + y2 = 0 + 171

Combine like terms: -171 + 171 = 0
0 + -4y + y2 = 0 + 171
-4y + y2 = 0 + 171

Combine like terms: 0 + 171 = 171
-4y + y2 = 171

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 = 171 + 4

Reorder the terms:
4 + -4y + y2 = 171 + 4

Combine like terms: 171 + 4 = 175
4 + -4y + y2 = 175

Factor a perfect square on the left side:
(y + -2)(y + -2) = 175

Calculate the square root of the right side: 13.228756555

Break this problem into two subproblems by setting 
(y + -2) equal to 13.228756555 and -13.228756555.

Subproblem 1

y + -2 = 13.228756555 Simplifying y + -2 = 13.228756555 Reorder the terms: -2 + y = 13.228756555 Solving -2 + y = 13.228756555 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 = 13.228756555 + 2 Combine like terms: -2 + 2 = 0 0 + y = 13.228756555 + 2 y = 13.228756555 + 2 Combine like terms: 13.228756555 + 2 = 15.228756555 y = 15.228756555 Simplifying y = 15.228756555

Subproblem 2

y + -2 = -13.228756555 Simplifying y + -2 = -13.228756555 Reorder the terms: -2 + y = -13.228756555 Solving -2 + y = -13.228756555 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 = -13.228756555 + 2 Combine like terms: -2 + 2 = 0 0 + y = -13.228756555 + 2 y = -13.228756555 + 2 Combine like terms: -13.228756555 + 2 = -11.228756555 y = -11.228756555 Simplifying y = -11.228756555

Solution

The solution to the problem is based on the solutions from the subproblems. y = {15.228756555, -11.228756555}

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