0.25y^2+2*0.25y=10-y

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Solution for 0.25y^2+2*0.25y=10-y equation:


Simplifying
0.25y2 + 2 * 0.25y = 10 + -1y

Multiply 2 * 0.25
0.25y2 + 0.5y = 10 + -1y

Reorder the terms:
0.5y + 0.25y2 = 10 + -1y

Solving
0.5y + 0.25y2 = 10 + -1y

Solving for variable 'y'.

Reorder the terms:
-10 + 0.5y + y + 0.25y2 = 10 + -1y + -10 + y

Combine like terms: 0.5y + y = 1.5y
-10 + 1.5y + 0.25y2 = 10 + -1y + -10 + y

Reorder the terms:
-10 + 1.5y + 0.25y2 = 10 + -10 + -1y + y

Combine like terms: 10 + -10 = 0
-10 + 1.5y + 0.25y2 = 0 + -1y + y
-10 + 1.5y + 0.25y2 = -1y + y

Combine like terms: -1y + y = 0
-10 + 1.5y + 0.25y2 = 0

Begin completing the square.  Divide all terms by
0.25 the coefficient of the squared term: 

Divide each side by '0.25'.
-40 + 6y + y2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 6y + 40 + y2 = 0 + 40

Reorder the terms:
-40 + 40 + 6y + y2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 6y + y2 = 0 + 40
6y + y2 = 0 + 40

Combine like terms: 0 + 40 = 40
6y + y2 = 40

The y term is 6y.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6y + 9 + y2 = 40 + 9

Reorder the terms:
9 + 6y + y2 = 40 + 9

Combine like terms: 40 + 9 = 49
9 + 6y + y2 = 49

Factor a perfect square on the left side:
(y + 3)(y + 3) = 49

Calculate the square root of the right side: 7

Break this problem into two subproblems by setting 
(y + 3) equal to 7 and -7.

Subproblem 1

y + 3 = 7 Simplifying y + 3 = 7 Reorder the terms: 3 + y = 7 Solving 3 + y = 7 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = 7 + -3 Combine like terms: 3 + -3 = 0 0 + y = 7 + -3 y = 7 + -3 Combine like terms: 7 + -3 = 4 y = 4 Simplifying y = 4

Subproblem 2

y + 3 = -7 Simplifying y + 3 = -7 Reorder the terms: 3 + y = -7 Solving 3 + y = -7 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = -7 + -3 Combine like terms: 3 + -3 = 0 0 + y = -7 + -3 y = -7 + -3 Combine like terms: -7 + -3 = -10 y = -10 Simplifying y = -10

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4, -10}

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