y^2-20y=-73

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Solution for y^2-20y=-73 equation:


Simplifying
y2 + -20y = -73

Reorder the terms:
-20y + y2 = -73

Solving
-20y + y2 = -73

Solving for variable 'y'.

Reorder the terms:
73 + -20y + y2 = -73 + 73

Combine like terms: -73 + 73 = 0
73 + -20y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-73' to each side of the equation.
73 + -20y + -73 + y2 = 0 + -73

Reorder the terms:
73 + -73 + -20y + y2 = 0 + -73

Combine like terms: 73 + -73 = 0
0 + -20y + y2 = 0 + -73
-20y + y2 = 0 + -73

Combine like terms: 0 + -73 = -73
-20y + y2 = -73

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 = -73 + 100

Reorder the terms:
100 + -20y + y2 = -73 + 100

Combine like terms: -73 + 100 = 27
100 + -20y + y2 = 27

Factor a perfect square on the left side:
(y + -10)(y + -10) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(y + -10) equal to 5.196152423 and -5.196152423.

Subproblem 1

y + -10 = 5.196152423 Simplifying y + -10 = 5.196152423 Reorder the terms: -10 + y = 5.196152423 Solving -10 + y = 5.196152423 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 = 5.196152423 + 10 Combine like terms: -10 + 10 = 0 0 + y = 5.196152423 + 10 y = 5.196152423 + 10 Combine like terms: 5.196152423 + 10 = 15.196152423 y = 15.196152423 Simplifying y = 15.196152423

Subproblem 2

y + -10 = -5.196152423 Simplifying y + -10 = -5.196152423 Reorder the terms: -10 + y = -5.196152423 Solving -10 + y = -5.196152423 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 = -5.196152423 + 10 Combine like terms: -10 + 10 = 0 0 + y = -5.196152423 + 10 y = -5.196152423 + 10 Combine like terms: -5.196152423 + 10 = 4.803847577 y = 4.803847577 Simplifying y = 4.803847577

Solution

The solution to the problem is based on the solutions from the subproblems. y = {15.196152423, 4.803847577}

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