y^2-5y=100

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Solution for y^2-5y=100 equation:


Simplifying
y2 + -5y = 100

Reorder the terms:
-5y + y2 = 100

Solving
-5y + y2 = 100

Solving for variable 'y'.

Reorder the terms:
-100 + -5y + y2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + -5y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -5y + 100 + y2 = 0 + 100

Reorder the terms:
-100 + 100 + -5y + y2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -5y + y2 = 0 + 100
-5y + y2 = 0 + 100

Combine like terms: 0 + 100 = 100
-5y + y2 = 100

The y term is -5y.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y + 6.25 + y2 = 100 + 6.25

Reorder the terms:
6.25 + -5y + y2 = 100 + 6.25

Combine like terms: 100 + 6.25 = 106.25
6.25 + -5y + y2 = 106.25

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 106.25

Calculate the square root of the right side: 10.307764064

Break this problem into two subproblems by setting 
(y + -2.5) equal to 10.307764064 and -10.307764064.

Subproblem 1

y + -2.5 = 10.307764064 Simplifying y + -2.5 = 10.307764064 Reorder the terms: -2.5 + y = 10.307764064 Solving -2.5 + y = 10.307764064 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = 10.307764064 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = 10.307764064 + 2.5 y = 10.307764064 + 2.5 Combine like terms: 10.307764064 + 2.5 = 12.807764064 y = 12.807764064 Simplifying y = 12.807764064

Subproblem 2

y + -2.5 = -10.307764064 Simplifying y + -2.5 = -10.307764064 Reorder the terms: -2.5 + y = -10.307764064 Solving -2.5 + y = -10.307764064 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = -10.307764064 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = -10.307764064 + 2.5 y = -10.307764064 + 2.5 Combine like terms: -10.307764064 + 2.5 = -7.807764064 y = -7.807764064 Simplifying y = -7.807764064

Solution

The solution to the problem is based on the solutions from the subproblems. y = {12.807764064, -7.807764064}

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