(2y^2+5y-2)-(-3y+7)=

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Solution for (2y^2+5y-2)-(-3y+7)= equation:


Simplifying
(2y2 + 5y + -2) + -1(-3y + 7) = 0

Reorder the terms:
(-2 + 5y + 2y2) + -1(-3y + 7) = 0

Remove parenthesis around (-2 + 5y + 2y2)
-2 + 5y + 2y2 + -1(-3y + 7) = 0

Reorder the terms:
-2 + 5y + 2y2 + -1(7 + -3y) = 0
-2 + 5y + 2y2 + (7 * -1 + -3y * -1) = 0
-2 + 5y + 2y2 + (-7 + 3y) = 0

Reorder the terms:
-2 + -7 + 5y + 3y + 2y2 = 0

Combine like terms: -2 + -7 = -9
-9 + 5y + 3y + 2y2 = 0

Combine like terms: 5y + 3y = 8y
-9 + 8y + 2y2 = 0

Solving
-9 + 8y + 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'.
-4.5 + 4y + y2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 4y + 4.5 + y2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 4y + y2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 4y + y2 = 0 + 4.5
4y + y2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
4y + y2 = 4.5

The y term is 4y.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4y + 4 + y2 = 4.5 + 4

Reorder the terms:
4 + 4y + y2 = 4.5 + 4

Combine like terms: 4.5 + 4 = 8.5
4 + 4y + y2 = 8.5

Factor a perfect square on the left side:
(y + 2)(y + 2) = 8.5

Calculate the square root of the right side: 2.915475947

Break this problem into two subproblems by setting 
(y + 2) equal to 2.915475947 and -2.915475947.

Subproblem 1

y + 2 = 2.915475947 Simplifying y + 2 = 2.915475947 Reorder the terms: 2 + y = 2.915475947 Solving 2 + y = 2.915475947 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = 2.915475947 + -2 Combine like terms: 2 + -2 = 0 0 + y = 2.915475947 + -2 y = 2.915475947 + -2 Combine like terms: 2.915475947 + -2 = 0.915475947 y = 0.915475947 Simplifying y = 0.915475947

Subproblem 2

y + 2 = -2.915475947 Simplifying y + 2 = -2.915475947 Reorder the terms: 2 + y = -2.915475947 Solving 2 + y = -2.915475947 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = -2.915475947 + -2 Combine like terms: 2 + -2 = 0 0 + y = -2.915475947 + -2 y = -2.915475947 + -2 Combine like terms: -2.915475947 + -2 = -4.915475947 y = -4.915475947 Simplifying y = -4.915475947

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.915475947, -4.915475947}

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