9y^2-4y=10

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Solution for 9y^2-4y=10 equation:


Simplifying
9y2 + -4y = 10

Reorder the terms:
-4y + 9y2 = 10

Solving
-4y + 9y2 = 10

Solving for variable 'y'.

Reorder the terms:
-10 + -4y + 9y2 = 10 + -10

Combine like terms: 10 + -10 = 0
-10 + -4y + 9y2 = 0

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

Divide each side by '9'.
-1.111111111 + -0.4444444444y + y2 = 0

Move the constant term to the right:

Add '1.111111111' to each side of the equation.
-1.111111111 + -0.4444444444y + 1.111111111 + y2 = 0 + 1.111111111

Reorder the terms:
-1.111111111 + 1.111111111 + -0.4444444444y + y2 = 0 + 1.111111111

Combine like terms: -1.111111111 + 1.111111111 = 0.000000000
0.000000000 + -0.4444444444y + y2 = 0 + 1.111111111
-0.4444444444y + y2 = 0 + 1.111111111

Combine like terms: 0 + 1.111111111 = 1.111111111
-0.4444444444y + y2 = 1.111111111

The y term is -0.4444444444y.  Take half its coefficient (-0.2222222222).
Square it (0.04938271604) and add it to both sides.

Add '0.04938271604' to each side of the equation.
-0.4444444444y + 0.04938271604 + y2 = 1.111111111 + 0.04938271604

Reorder the terms:
0.04938271604 + -0.4444444444y + y2 = 1.111111111 + 0.04938271604

Combine like terms: 1.111111111 + 0.04938271604 = 1.16049382704
0.04938271604 + -0.4444444444y + y2 = 1.16049382704

Factor a perfect square on the left side:
(y + -0.2222222222)(y + -0.2222222222) = 1.16049382704

Calculate the square root of the right side: 1.07726219

Break this problem into two subproblems by setting 
(y + -0.2222222222) equal to 1.07726219 and -1.07726219.

Subproblem 1

y + -0.2222222222 = 1.07726219 Simplifying y + -0.2222222222 = 1.07726219 Reorder the terms: -0.2222222222 + y = 1.07726219 Solving -0.2222222222 + y = 1.07726219 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2222222222' to each side of the equation. -0.2222222222 + 0.2222222222 + y = 1.07726219 + 0.2222222222 Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000 0.0000000000 + y = 1.07726219 + 0.2222222222 y = 1.07726219 + 0.2222222222 Combine like terms: 1.07726219 + 0.2222222222 = 1.2994844122 y = 1.2994844122 Simplifying y = 1.2994844122

Subproblem 2

y + -0.2222222222 = -1.07726219 Simplifying y + -0.2222222222 = -1.07726219 Reorder the terms: -0.2222222222 + y = -1.07726219 Solving -0.2222222222 + y = -1.07726219 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2222222222' to each side of the equation. -0.2222222222 + 0.2222222222 + y = -1.07726219 + 0.2222222222 Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000 0.0000000000 + y = -1.07726219 + 0.2222222222 y = -1.07726219 + 0.2222222222 Combine like terms: -1.07726219 + 0.2222222222 = -0.8550399678 y = -0.8550399678 Simplifying y = -0.8550399678

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.2994844122, -0.8550399678}

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