-10y^2+3y=-9

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Solution for -10y^2+3y=-9 equation:


Simplifying
-10y2 + 3y = -9

Reorder the terms:
3y + -10y2 = -9

Solving
3y + -10y2 = -9

Solving for variable 'y'.

Reorder the terms:
9 + 3y + -10y2 = -9 + 9

Combine like terms: -9 + 9 = 0
9 + 3y + -10y2 = 0

Begin completing the square.  Divide all terms by
-10 the coefficient of the squared term: 

Divide each side by '-10'.
-0.9 + -0.3y + y2 = 0

Move the constant term to the right:

Add '0.9' to each side of the equation.
-0.9 + -0.3y + 0.9 + y2 = 0 + 0.9

Reorder the terms:
-0.9 + 0.9 + -0.3y + y2 = 0 + 0.9

Combine like terms: -0.9 + 0.9 = 0.0
0.0 + -0.3y + y2 = 0 + 0.9
-0.3y + y2 = 0 + 0.9

Combine like terms: 0 + 0.9 = 0.9
-0.3y + y2 = 0.9

The y term is -0.3y.  Take half its coefficient (-0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
-0.3y + 0.0225 + y2 = 0.9 + 0.0225

Reorder the terms:
0.0225 + -0.3y + y2 = 0.9 + 0.0225

Combine like terms: 0.9 + 0.0225 = 0.9225
0.0225 + -0.3y + y2 = 0.9225

Factor a perfect square on the left side:
(y + -0.15)(y + -0.15) = 0.9225

Calculate the square root of the right side: 0.960468636

Break this problem into two subproblems by setting 
(y + -0.15) equal to 0.960468636 and -0.960468636.

Subproblem 1

y + -0.15 = 0.960468636 Simplifying y + -0.15 = 0.960468636 Reorder the terms: -0.15 + y = 0.960468636 Solving -0.15 + y = 0.960468636 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + y = 0.960468636 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + y = 0.960468636 + 0.15 y = 0.960468636 + 0.15 Combine like terms: 0.960468636 + 0.15 = 1.110468636 y = 1.110468636 Simplifying y = 1.110468636

Subproblem 2

y + -0.15 = -0.960468636 Simplifying y + -0.15 = -0.960468636 Reorder the terms: -0.15 + y = -0.960468636 Solving -0.15 + y = -0.960468636 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + y = -0.960468636 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + y = -0.960468636 + 0.15 y = -0.960468636 + 0.15 Combine like terms: -0.960468636 + 0.15 = -0.810468636 y = -0.810468636 Simplifying y = -0.810468636

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.110468636, -0.810468636}

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