2y+5y(2-y)=3-5

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Solution for 2y+5y(2-y)=3-5 equation:


Simplifying
2y + 5y(2 + -1y) = 3 + -5
2y + (2 * 5y + -1y * 5y) = 3 + -5
2y + (10y + -5y2) = 3 + -5

Combine like terms: 2y + 10y = 12y
12y + -5y2 = 3 + -5

Combine like terms: 3 + -5 = -2
12y + -5y2 = -2

Solving
12y + -5y2 = -2

Solving for variable 'y'.

Reorder the terms:
2 + 12y + -5y2 = -2 + 2

Combine like terms: -2 + 2 = 0
2 + 12y + -5y2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-0.4 + -2.4y + y2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -2.4y + 0.4 + y2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -2.4y + y2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -2.4y + y2 = 0 + 0.4
-2.4y + y2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-2.4y + y2 = 0.4

The y term is -2.4y.  Take half its coefficient (-1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
-2.4y + 1.44 + y2 = 0.4 + 1.44

Reorder the terms:
1.44 + -2.4y + y2 = 0.4 + 1.44

Combine like terms: 0.4 + 1.44 = 1.84
1.44 + -2.4y + y2 = 1.84

Factor a perfect square on the left side:
(y + -1.2)(y + -1.2) = 1.84

Calculate the square root of the right side: 1.356465997

Break this problem into two subproblems by setting 
(y + -1.2) equal to 1.356465997 and -1.356465997.

Subproblem 1

y + -1.2 = 1.356465997 Simplifying y + -1.2 = 1.356465997 Reorder the terms: -1.2 + y = 1.356465997 Solving -1.2 + y = 1.356465997 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + y = 1.356465997 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + y = 1.356465997 + 1.2 y = 1.356465997 + 1.2 Combine like terms: 1.356465997 + 1.2 = 2.556465997 y = 2.556465997 Simplifying y = 2.556465997

Subproblem 2

y + -1.2 = -1.356465997 Simplifying y + -1.2 = -1.356465997 Reorder the terms: -1.2 + y = -1.356465997 Solving -1.2 + y = -1.356465997 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + y = -1.356465997 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + y = -1.356465997 + 1.2 y = -1.356465997 + 1.2 Combine like terms: -1.356465997 + 1.2 = -0.156465997 y = -0.156465997 Simplifying y = -0.156465997

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.556465997, -0.156465997}

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