9y^2+22y-4=0

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Solution for 9y^2+22y-4=0 equation:


Simplifying
9y2 + 22y + -4 = 0

Reorder the terms:
-4 + 22y + 9y2 = 0

Solving
-4 + 22y + 9y2 = 0

Solving for variable 'y'.

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

Divide each side by '9'.
-0.4444444444 + 2.444444444y + y2 = 0

Move the constant term to the right:

Add '0.4444444444' to each side of the equation.
-0.4444444444 + 2.444444444y + 0.4444444444 + y2 = 0 + 0.4444444444

Reorder the terms:
-0.4444444444 + 0.4444444444 + 2.444444444y + y2 = 0 + 0.4444444444

Combine like terms: -0.4444444444 + 0.4444444444 = 0.0000000000
0.0000000000 + 2.444444444y + y2 = 0 + 0.4444444444
2.444444444y + y2 = 0 + 0.4444444444

Combine like terms: 0 + 0.4444444444 = 0.4444444444
2.444444444y + y2 = 0.4444444444

The y term is 2.444444444y.  Take half its coefficient (1.222222222).
Square it (1.493827160) and add it to both sides.

Add '1.493827160' to each side of the equation.
2.444444444y + 1.493827160 + y2 = 0.4444444444 + 1.493827160

Reorder the terms:
1.493827160 + 2.444444444y + y2 = 0.4444444444 + 1.493827160

Combine like terms: 0.4444444444 + 1.493827160 = 1.9382716044
1.493827160 + 2.444444444y + y2 = 1.9382716044

Factor a perfect square on the left side:
(y + 1.222222222)(y + 1.222222222) = 1.9382716044

Calculate the square root of the right side: 1.392218232

Break this problem into two subproblems by setting 
(y + 1.222222222) equal to 1.392218232 and -1.392218232.

Subproblem 1

y + 1.222222222 = 1.392218232 Simplifying y + 1.222222222 = 1.392218232 Reorder the terms: 1.222222222 + y = 1.392218232 Solving 1.222222222 + y = 1.392218232 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.222222222' to each side of the equation. 1.222222222 + -1.222222222 + y = 1.392218232 + -1.222222222 Combine like terms: 1.222222222 + -1.222222222 = 0.000000000 0.000000000 + y = 1.392218232 + -1.222222222 y = 1.392218232 + -1.222222222 Combine like terms: 1.392218232 + -1.222222222 = 0.16999601 y = 0.16999601 Simplifying y = 0.16999601

Subproblem 2

y + 1.222222222 = -1.392218232 Simplifying y + 1.222222222 = -1.392218232 Reorder the terms: 1.222222222 + y = -1.392218232 Solving 1.222222222 + y = -1.392218232 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.222222222' to each side of the equation. 1.222222222 + -1.222222222 + y = -1.392218232 + -1.222222222 Combine like terms: 1.222222222 + -1.222222222 = 0.000000000 0.000000000 + y = -1.392218232 + -1.222222222 y = -1.392218232 + -1.222222222 Combine like terms: -1.392218232 + -1.222222222 = -2.614440454 y = -2.614440454 Simplifying y = -2.614440454

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.16999601, -2.614440454}

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