(4y^2+5y-1)-(2y^2+3y+2)=

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Solution for (4y^2+5y-1)-(2y^2+3y+2)= equation:


Simplifying
(4y2 + 5y + -1) + -1(2y2 + 3y + 2) = 0

Reorder the terms:
(-1 + 5y + 4y2) + -1(2y2 + 3y + 2) = 0

Remove parenthesis around (-1 + 5y + 4y2)
-1 + 5y + 4y2 + -1(2y2 + 3y + 2) = 0

Reorder the terms:
-1 + 5y + 4y2 + -1(2 + 3y + 2y2) = 0
-1 + 5y + 4y2 + (2 * -1 + 3y * -1 + 2y2 * -1) = 0
-1 + 5y + 4y2 + (-2 + -3y + -2y2) = 0

Reorder the terms:
-1 + -2 + 5y + -3y + 4y2 + -2y2 = 0

Combine like terms: -1 + -2 = -3
-3 + 5y + -3y + 4y2 + -2y2 = 0

Combine like terms: 5y + -3y = 2y
-3 + 2y + 4y2 + -2y2 = 0

Combine like terms: 4y2 + -2y2 = 2y2
-3 + 2y + 2y2 = 0

Solving
-3 + 2y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-1.5 + y + y2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + y + 1.5 + y2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + y + y2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + y + y2 = 0 + 1.5
y + y2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
y + y2 = 1.5

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + y2 = 1.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + y2 = 1.5 + 0.25

Combine like terms: 1.5 + 0.25 = 1.75
1.25 + y2 = 1.75

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 1.75

Calculate the square root of the right side: 1.322875656

Break this problem into two subproblems by setting 
(y + 0.5) equal to 1.322875656 and -1.322875656.

Subproblem 1

y + 0.5 = 1.322875656 Simplifying y + 0.5 = 1.322875656 Reorder the terms: 0.5 + y = 1.322875656 Solving 0.5 + y = 1.322875656 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 1.322875656 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 1.322875656 + -0.5 y = 1.322875656 + -0.5 Combine like terms: 1.322875656 + -0.5 = 0.822875656 y = 0.822875656 Simplifying y = 0.822875656

Subproblem 2

y + 0.5 = -1.322875656 Simplifying y + 0.5 = -1.322875656 Reorder the terms: 0.5 + y = -1.322875656 Solving 0.5 + y = -1.322875656 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -1.322875656 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -1.322875656 + -0.5 y = -1.322875656 + -0.5 Combine like terms: -1.322875656 + -0.5 = -1.822875656 y = -1.822875656 Simplifying y = -1.822875656

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.822875656, -1.822875656}

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