40y^2-217y-444=0

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Solution for 40y^2-217y-444=0 equation:


Simplifying
40y2 + -217y + -444 = 0

Reorder the terms:
-444 + -217y + 40y2 = 0

Solving
-444 + -217y + 40y2 = 0

Solving for variable 'y'.

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

Divide each side by '40'.
-11.1 + -5.425y + y2 = 0

Move the constant term to the right:

Add '11.1' to each side of the equation.
-11.1 + -5.425y + 11.1 + y2 = 0 + 11.1

Reorder the terms:
-11.1 + 11.1 + -5.425y + y2 = 0 + 11.1

Combine like terms: -11.1 + 11.1 = 0.0
0.0 + -5.425y + y2 = 0 + 11.1
-5.425y + y2 = 0 + 11.1

Combine like terms: 0 + 11.1 = 11.1
-5.425y + y2 = 11.1

The y term is -5.425y.  Take half its coefficient (-2.7125).
Square it (7.35765625) and add it to both sides.

Add '7.35765625' to each side of the equation.
-5.425y + 7.35765625 + y2 = 11.1 + 7.35765625

Reorder the terms:
7.35765625 + -5.425y + y2 = 11.1 + 7.35765625

Combine like terms: 11.1 + 7.35765625 = 18.45765625
7.35765625 + -5.425y + y2 = 18.45765625

Factor a perfect square on the left side:
(y + -2.7125)(y + -2.7125) = 18.45765625

Calculate the square root of the right side: 4.296237453

Break this problem into two subproblems by setting 
(y + -2.7125) equal to 4.296237453 and -4.296237453.

Subproblem 1

y + -2.7125 = 4.296237453 Simplifying y + -2.7125 = 4.296237453 Reorder the terms: -2.7125 + y = 4.296237453 Solving -2.7125 + y = 4.296237453 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.7125' to each side of the equation. -2.7125 + 2.7125 + y = 4.296237453 + 2.7125 Combine like terms: -2.7125 + 2.7125 = 0.0000 0.0000 + y = 4.296237453 + 2.7125 y = 4.296237453 + 2.7125 Combine like terms: 4.296237453 + 2.7125 = 7.008737453 y = 7.008737453 Simplifying y = 7.008737453

Subproblem 2

y + -2.7125 = -4.296237453 Simplifying y + -2.7125 = -4.296237453 Reorder the terms: -2.7125 + y = -4.296237453 Solving -2.7125 + y = -4.296237453 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.7125' to each side of the equation. -2.7125 + 2.7125 + y = -4.296237453 + 2.7125 Combine like terms: -2.7125 + 2.7125 = 0.0000 0.0000 + y = -4.296237453 + 2.7125 y = -4.296237453 + 2.7125 Combine like terms: -4.296237453 + 2.7125 = -1.583737453 y = -1.583737453 Simplifying y = -1.583737453

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.008737453, -1.583737453}

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