y^2-10y=25

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Solution for y^2-10y=25 equation:


Simplifying
y2 + -10y = 25

Reorder the terms:
-10y + y2 = 25

Solving
-10y + y2 = 25

Solving for variable 'y'.

Reorder the terms:
-25 + -10y + y2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + -10y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -10y + 25 + y2 = 0 + 25

Reorder the terms:
-25 + 25 + -10y + y2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -10y + y2 = 0 + 25
-10y + y2 = 0 + 25

Combine like terms: 0 + 25 = 25
-10y + y2 = 25

The y term is -10y.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10y + 25 + y2 = 25 + 25

Reorder the terms:
25 + -10y + y2 = 25 + 25

Combine like terms: 25 + 25 = 50
25 + -10y + y2 = 50

Factor a perfect square on the left side:
(y + -5)(y + -5) = 50

Calculate the square root of the right side: 7.071067812

Break this problem into two subproblems by setting 
(y + -5) equal to 7.071067812 and -7.071067812.

Subproblem 1

y + -5 = 7.071067812 Simplifying y + -5 = 7.071067812 Reorder the terms: -5 + y = 7.071067812 Solving -5 + y = 7.071067812 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = 7.071067812 + 5 Combine like terms: -5 + 5 = 0 0 + y = 7.071067812 + 5 y = 7.071067812 + 5 Combine like terms: 7.071067812 + 5 = 12.071067812 y = 12.071067812 Simplifying y = 12.071067812

Subproblem 2

y + -5 = -7.071067812 Simplifying y + -5 = -7.071067812 Reorder the terms: -5 + y = -7.071067812 Solving -5 + y = -7.071067812 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = -7.071067812 + 5 Combine like terms: -5 + 5 = 0 0 + y = -7.071067812 + 5 y = -7.071067812 + 5 Combine like terms: -7.071067812 + 5 = -2.071067812 y = -2.071067812 Simplifying y = -2.071067812

Solution

The solution to the problem is based on the solutions from the subproblems. y = {12.071067812, -2.071067812}

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