(-9+90y-1)y+9y-90=0

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Solution for (-9+90y-1)y+9y-90=0 equation:


Simplifying
(-9 + 90y + -1) * y + 9y + -90 = 0

Reorder the terms:
(-9 + -1 + 90y) * y + 9y + -90 = 0

Combine like terms: -9 + -1 = -10
(-10 + 90y) * y + 9y + -90 = 0

Reorder the terms for easier multiplication:
y(-10 + 90y) + 9y + -90 = 0
(-10 * y + 90y * y) + 9y + -90 = 0
(-10y + 90y2) + 9y + -90 = 0

Reorder the terms:
-90 + -10y + 9y + 90y2 = 0

Combine like terms: -10y + 9y = -1y
-90 + -1y + 90y2 = 0

Solving
-90 + -1y + 90y2 = 0

Solving for variable 'y'.

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

Divide each side by '90'.
-1 + -0.01111111111y + y2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.01111111111y + 1 + y2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.01111111111y + y2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.01111111111y + y2 = 0 + 1
-0.01111111111y + y2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.01111111111y + y2 = 1

The y term is -0.01111111111y.  Take half its coefficient (-0.005555555555).
Square it (0.00003086419752) and add it to both sides.

Add '0.00003086419752' to each side of the equation.
-0.01111111111y + 0.00003086419752 + y2 = 1 + 0.00003086419752

Reorder the terms:
0.00003086419752 + -0.01111111111y + y2 = 1 + 0.00003086419752

Combine like terms: 1 + 0.00003086419752 = 1.00003086419752
0.00003086419752 + -0.01111111111y + y2 = 1.00003086419752

Factor a perfect square on the left side:
(y + -0.005555555555)(y + -0.005555555555) = 1.00003086419752

Calculate the square root of the right side: 1.000015432

Break this problem into two subproblems by setting 
(y + -0.005555555555) equal to 1.000015432 and -1.000015432.

Subproblem 1

y + -0.005555555555 = 1.000015432 Simplifying y + -0.005555555555 = 1.000015432 Reorder the terms: -0.005555555555 + y = 1.000015432 Solving -0.005555555555 + y = 1.000015432 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.005555555555' to each side of the equation. -0.005555555555 + 0.005555555555 + y = 1.000015432 + 0.005555555555 Combine like terms: -0.005555555555 + 0.005555555555 = 0.000000000000 0.000000000000 + y = 1.000015432 + 0.005555555555 y = 1.000015432 + 0.005555555555 Combine like terms: 1.000015432 + 0.005555555555 = 1.005570987555 y = 1.005570987555 Simplifying y = 1.005570987555

Subproblem 2

y + -0.005555555555 = -1.000015432 Simplifying y + -0.005555555555 = -1.000015432 Reorder the terms: -0.005555555555 + y = -1.000015432 Solving -0.005555555555 + y = -1.000015432 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.005555555555' to each side of the equation. -0.005555555555 + 0.005555555555 + y = -1.000015432 + 0.005555555555 Combine like terms: -0.005555555555 + 0.005555555555 = 0.000000000000 0.000000000000 + y = -1.000015432 + 0.005555555555 y = -1.000015432 + 0.005555555555 Combine like terms: -1.000015432 + 0.005555555555 = -0.994459876445 y = -0.994459876445 Simplifying y = -0.994459876445

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.005570987555, -0.994459876445}

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