19y^2-18y-16=0

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Solution for 19y^2-18y-16=0 equation:


Simplifying
19y2 + -18y + -16 = 0

Reorder the terms:
-16 + -18y + 19y2 = 0

Solving
-16 + -18y + 19y2 = 0

Solving for variable 'y'.

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

Divide each side by '19'.
-0.8421052632 + -0.9473684211y + y2 = 0

Move the constant term to the right:

Add '0.8421052632' to each side of the equation.
-0.8421052632 + -0.9473684211y + 0.8421052632 + y2 = 0 + 0.8421052632

Reorder the terms:
-0.8421052632 + 0.8421052632 + -0.9473684211y + y2 = 0 + 0.8421052632

Combine like terms: -0.8421052632 + 0.8421052632 = 0.0000000000
0.0000000000 + -0.9473684211y + y2 = 0 + 0.8421052632
-0.9473684211y + y2 = 0 + 0.8421052632

Combine like terms: 0 + 0.8421052632 = 0.8421052632
-0.9473684211y + y2 = 0.8421052632

The y term is -0.9473684211y.  Take half its coefficient (-0.4736842106).
Square it (0.2243767314) and add it to both sides.

Add '0.2243767314' to each side of the equation.
-0.9473684211y + 0.2243767314 + y2 = 0.8421052632 + 0.2243767314

Reorder the terms:
0.2243767314 + -0.9473684211y + y2 = 0.8421052632 + 0.2243767314

Combine like terms: 0.8421052632 + 0.2243767314 = 1.0664819946
0.2243767314 + -0.9473684211y + y2 = 1.0664819946

Factor a perfect square on the left side:
(y + -0.4736842106)(y + -0.4736842106) = 1.0664819946

Calculate the square root of the right side: 1.032706151

Break this problem into two subproblems by setting 
(y + -0.4736842106) equal to 1.032706151 and -1.032706151.

Subproblem 1

y + -0.4736842106 = 1.032706151 Simplifying y + -0.4736842106 = 1.032706151 Reorder the terms: -0.4736842106 + y = 1.032706151 Solving -0.4736842106 + y = 1.032706151 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4736842106' to each side of the equation. -0.4736842106 + 0.4736842106 + y = 1.032706151 + 0.4736842106 Combine like terms: -0.4736842106 + 0.4736842106 = 0.0000000000 0.0000000000 + y = 1.032706151 + 0.4736842106 y = 1.032706151 + 0.4736842106 Combine like terms: 1.032706151 + 0.4736842106 = 1.5063903616 y = 1.5063903616 Simplifying y = 1.5063903616

Subproblem 2

y + -0.4736842106 = -1.032706151 Simplifying y + -0.4736842106 = -1.032706151 Reorder the terms: -0.4736842106 + y = -1.032706151 Solving -0.4736842106 + y = -1.032706151 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4736842106' to each side of the equation. -0.4736842106 + 0.4736842106 + y = -1.032706151 + 0.4736842106 Combine like terms: -0.4736842106 + 0.4736842106 = 0.0000000000 0.0000000000 + y = -1.032706151 + 0.4736842106 y = -1.032706151 + 0.4736842106 Combine like terms: -1.032706151 + 0.4736842106 = -0.5590219404 y = -0.5590219404 Simplifying y = -0.5590219404

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.5063903616, -0.5590219404}

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