3y^2-7y+5=-2y^2+4y+6

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Solution for 3y^2-7y+5=-2y^2+4y+6 equation:


Simplifying
3y2 + -7y + 5 = -2y2 + 4y + 6

Reorder the terms:
5 + -7y + 3y2 = -2y2 + 4y + 6

Reorder the terms:
5 + -7y + 3y2 = 6 + 4y + -2y2

Solving
5 + -7y + 3y2 = 6 + 4y + -2y2

Solving for variable 'y'.

Reorder the terms:
5 + -6 + -7y + -4y + 3y2 + 2y2 = 6 + 4y + -2y2 + -6 + -4y + 2y2

Combine like terms: 5 + -6 = -1
-1 + -7y + -4y + 3y2 + 2y2 = 6 + 4y + -2y2 + -6 + -4y + 2y2

Combine like terms: -7y + -4y = -11y
-1 + -11y + 3y2 + 2y2 = 6 + 4y + -2y2 + -6 + -4y + 2y2

Combine like terms: 3y2 + 2y2 = 5y2
-1 + -11y + 5y2 = 6 + 4y + -2y2 + -6 + -4y + 2y2

Reorder the terms:
-1 + -11y + 5y2 = 6 + -6 + 4y + -4y + -2y2 + 2y2

Combine like terms: 6 + -6 = 0
-1 + -11y + 5y2 = 0 + 4y + -4y + -2y2 + 2y2
-1 + -11y + 5y2 = 4y + -4y + -2y2 + 2y2

Combine like terms: 4y + -4y = 0
-1 + -11y + 5y2 = 0 + -2y2 + 2y2
-1 + -11y + 5y2 = -2y2 + 2y2

Combine like terms: -2y2 + 2y2 = 0
-1 + -11y + 5y2 = 0

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

Divide each side by '5'.
-0.2 + -2.2y + y2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -2.2y + 0.2 + y2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -2.2y + y2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -2.2y + y2 = 0 + 0.2
-2.2y + y2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-2.2y + y2 = 0.2

The y term is -2.2y.  Take half its coefficient (-1.1).
Square it (1.21) and add it to both sides.

Add '1.21' to each side of the equation.
-2.2y + 1.21 + y2 = 0.2 + 1.21

Reorder the terms:
1.21 + -2.2y + y2 = 0.2 + 1.21

Combine like terms: 0.2 + 1.21 = 1.41
1.21 + -2.2y + y2 = 1.41

Factor a perfect square on the left side:
(y + -1.1)(y + -1.1) = 1.41

Calculate the square root of the right side: 1.187434209

Break this problem into two subproblems by setting 
(y + -1.1) equal to 1.187434209 and -1.187434209.

Subproblem 1

y + -1.1 = 1.187434209 Simplifying y + -1.1 = 1.187434209 Reorder the terms: -1.1 + y = 1.187434209 Solving -1.1 + y = 1.187434209 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.1' to each side of the equation. -1.1 + 1.1 + y = 1.187434209 + 1.1 Combine like terms: -1.1 + 1.1 = 0.0 0.0 + y = 1.187434209 + 1.1 y = 1.187434209 + 1.1 Combine like terms: 1.187434209 + 1.1 = 2.287434209 y = 2.287434209 Simplifying y = 2.287434209

Subproblem 2

y + -1.1 = -1.187434209 Simplifying y + -1.1 = -1.187434209 Reorder the terms: -1.1 + y = -1.187434209 Solving -1.1 + y = -1.187434209 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.1' to each side of the equation. -1.1 + 1.1 + y = -1.187434209 + 1.1 Combine like terms: -1.1 + 1.1 = 0.0 0.0 + y = -1.187434209 + 1.1 y = -1.187434209 + 1.1 Combine like terms: -1.187434209 + 1.1 = -0.087434209 y = -0.087434209 Simplifying y = -0.087434209

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.287434209, -0.087434209}

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