y^2-20y=4

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Solution for y^2-20y=4 equation:


Simplifying
y2 + -20y = 4

Reorder the terms:
-20y + y2 = 4

Solving
-20y + y2 = 4

Solving for variable 'y'.

Reorder the terms:
-4 + -20y + y2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + -20y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -20y + 4 + y2 = 0 + 4

Reorder the terms:
-4 + 4 + -20y + y2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -20y + y2 = 0 + 4
-20y + y2 = 0 + 4

Combine like terms: 0 + 4 = 4
-20y + y2 = 4

The y term is -20y.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20y + 100 + y2 = 4 + 100

Reorder the terms:
100 + -20y + y2 = 4 + 100

Combine like terms: 4 + 100 = 104
100 + -20y + y2 = 104

Factor a perfect square on the left side:
(y + -10)(y + -10) = 104

Calculate the square root of the right side: 10.198039027

Break this problem into two subproblems by setting 
(y + -10) equal to 10.198039027 and -10.198039027.

Subproblem 1

y + -10 = 10.198039027 Simplifying y + -10 = 10.198039027 Reorder the terms: -10 + y = 10.198039027 Solving -10 + y = 10.198039027 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + y = 10.198039027 + 10 Combine like terms: -10 + 10 = 0 0 + y = 10.198039027 + 10 y = 10.198039027 + 10 Combine like terms: 10.198039027 + 10 = 20.198039027 y = 20.198039027 Simplifying y = 20.198039027

Subproblem 2

y + -10 = -10.198039027 Simplifying y + -10 = -10.198039027 Reorder the terms: -10 + y = -10.198039027 Solving -10 + y = -10.198039027 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + y = -10.198039027 + 10 Combine like terms: -10 + 10 = 0 0 + y = -10.198039027 + 10 y = -10.198039027 + 10 Combine like terms: -10.198039027 + 10 = -0.198039027 y = -0.198039027 Simplifying y = -0.198039027

Solution

The solution to the problem is based on the solutions from the subproblems. y = {20.198039027, -0.198039027}

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