9+8y-3y^2+6y+2-4y^2=

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Solution for 9+8y-3y^2+6y+2-4y^2= equation:


Simplifying
9 + 8y + -3y2 + 6y + 2 + -4y2 = 0

Reorder the terms:
9 + 2 + 8y + 6y + -3y2 + -4y2 = 0

Combine like terms: 9 + 2 = 11
11 + 8y + 6y + -3y2 + -4y2 = 0

Combine like terms: 8y + 6y = 14y
11 + 14y + -3y2 + -4y2 = 0

Combine like terms: -3y2 + -4y2 = -7y2
11 + 14y + -7y2 = 0

Solving
11 + 14y + -7y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
-1.571428571 + -2y + y2 = 0

Move the constant term to the right:

Add '1.571428571' to each side of the equation.
-1.571428571 + -2y + 1.571428571 + y2 = 0 + 1.571428571

Reorder the terms:
-1.571428571 + 1.571428571 + -2y + y2 = 0 + 1.571428571

Combine like terms: -1.571428571 + 1.571428571 = 0.000000000
0.000000000 + -2y + y2 = 0 + 1.571428571
-2y + y2 = 0 + 1.571428571

Combine like terms: 0 + 1.571428571 = 1.571428571
-2y + y2 = 1.571428571

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 = 1.571428571 + 1

Reorder the terms:
1 + -2y + y2 = 1.571428571 + 1

Combine like terms: 1.571428571 + 1 = 2.571428571
1 + -2y + y2 = 2.571428571

Factor a perfect square on the left side:
(y + -1)(y + -1) = 2.571428571

Calculate the square root of the right side: 1.603567451

Break this problem into two subproblems by setting 
(y + -1) equal to 1.603567451 and -1.603567451.

Subproblem 1

y + -1 = 1.603567451 Simplifying y + -1 = 1.603567451 Reorder the terms: -1 + y = 1.603567451 Solving -1 + y = 1.603567451 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 = 1.603567451 + 1 Combine like terms: -1 + 1 = 0 0 + y = 1.603567451 + 1 y = 1.603567451 + 1 Combine like terms: 1.603567451 + 1 = 2.603567451 y = 2.603567451 Simplifying y = 2.603567451

Subproblem 2

y + -1 = -1.603567451 Simplifying y + -1 = -1.603567451 Reorder the terms: -1 + y = -1.603567451 Solving -1 + y = -1.603567451 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 = -1.603567451 + 1 Combine like terms: -1 + 1 = 0 0 + y = -1.603567451 + 1 y = -1.603567451 + 1 Combine like terms: -1.603567451 + 1 = -0.603567451 y = -0.603567451 Simplifying y = -0.603567451

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.603567451, -0.603567451}

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