y^2-25y=100

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Solution for y^2-25y=100 equation:


Simplifying
y2 + -25y = 100

Reorder the terms:
-25y + y2 = 100

Solving
-25y + y2 = 100

Solving for variable 'y'.

Reorder the terms:
-100 + -25y + y2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + -25y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -25y + 100 + y2 = 0 + 100

Reorder the terms:
-100 + 100 + -25y + y2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -25y + y2 = 0 + 100
-25y + y2 = 0 + 100

Combine like terms: 0 + 100 = 100
-25y + y2 = 100

The y term is -25y.  Take half its coefficient (-12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
-25y + 156.25 + y2 = 100 + 156.25

Reorder the terms:
156.25 + -25y + y2 = 100 + 156.25

Combine like terms: 100 + 156.25 = 256.25
156.25 + -25y + y2 = 256.25

Factor a perfect square on the left side:
(y + -12.5)(y + -12.5) = 256.25

Calculate the square root of the right side: 16.007810594

Break this problem into two subproblems by setting 
(y + -12.5) equal to 16.007810594 and -16.007810594.

Subproblem 1

y + -12.5 = 16.007810594 Simplifying y + -12.5 = 16.007810594 Reorder the terms: -12.5 + y = 16.007810594 Solving -12.5 + y = 16.007810594 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + y = 16.007810594 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + y = 16.007810594 + 12.5 y = 16.007810594 + 12.5 Combine like terms: 16.007810594 + 12.5 = 28.507810594 y = 28.507810594 Simplifying y = 28.507810594

Subproblem 2

y + -12.5 = -16.007810594 Simplifying y + -12.5 = -16.007810594 Reorder the terms: -12.5 + y = -16.007810594 Solving -12.5 + y = -16.007810594 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + y = -16.007810594 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + y = -16.007810594 + 12.5 y = -16.007810594 + 12.5 Combine like terms: -16.007810594 + 12.5 = -3.507810594 y = -3.507810594 Simplifying y = -3.507810594

Solution

The solution to the problem is based on the solutions from the subproblems. y = {28.507810594, -3.507810594}

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