5-4y+4+4y^2-5y^2+2y=

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


Simplifying
5 + -4y + 4 + 4y2 + -5y2 + 2y = 0

Reorder the terms:
5 + 4 + -4y + 2y + 4y2 + -5y2 = 0

Combine like terms: 5 + 4 = 9
9 + -4y + 2y + 4y2 + -5y2 = 0

Combine like terms: -4y + 2y = -2y
9 + -2y + 4y2 + -5y2 = 0

Combine like terms: 4y2 + -5y2 = -1y2
9 + -2y + -1y2 = 0

Solving
9 + -2y + -1y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-9 + 2y + y2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 2y + 9 + y2 = 0 + 9

Reorder the terms:
-9 + 9 + 2y + y2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 2y + y2 = 0 + 9
2y + y2 = 0 + 9

Combine like terms: 0 + 9 = 9
2y + y2 = 9

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 9 + 1

Reorder the terms:
1 + 2y + y2 = 9 + 1

Combine like terms: 9 + 1 = 10
1 + 2y + y2 = 10

Factor a perfect square on the left side:
(y + 1)(y + 1) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(y + 1) equal to 3.16227766 and -3.16227766.

Subproblem 1

y + 1 = 3.16227766 Simplifying y + 1 = 3.16227766 Reorder the terms: 1 + y = 3.16227766 Solving 1 + y = 3.16227766 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 3.16227766 + -1 Combine like terms: 1 + -1 = 0 0 + y = 3.16227766 + -1 y = 3.16227766 + -1 Combine like terms: 3.16227766 + -1 = 2.16227766 y = 2.16227766 Simplifying y = 2.16227766

Subproblem 2

y + 1 = -3.16227766 Simplifying y + 1 = -3.16227766 Reorder the terms: 1 + y = -3.16227766 Solving 1 + y = -3.16227766 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -3.16227766 + -1 Combine like terms: 1 + -1 = 0 0 + y = -3.16227766 + -1 y = -3.16227766 + -1 Combine like terms: -3.16227766 + -1 = -4.16227766 y = -4.16227766 Simplifying y = -4.16227766

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.16227766, -4.16227766}

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