-5y^2+57y+40=0

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Solution for -5y^2+57y+40=0 equation:


Simplifying
-5y2 + 57y + 40 = 0

Reorder the terms:
40 + 57y + -5y2 = 0

Solving
40 + 57y + -5y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-8 + -11.4y + y2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -11.4y + 8 + y2 = 0 + 8

Reorder the terms:
-8 + 8 + -11.4y + y2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -11.4y + y2 = 0 + 8
-11.4y + y2 = 0 + 8

Combine like terms: 0 + 8 = 8
-11.4y + y2 = 8

The y term is -11.4y.  Take half its coefficient (-5.7).
Square it (32.49) and add it to both sides.

Add '32.49' to each side of the equation.
-11.4y + 32.49 + y2 = 8 + 32.49

Reorder the terms:
32.49 + -11.4y + y2 = 8 + 32.49

Combine like terms: 8 + 32.49 = 40.49
32.49 + -11.4y + y2 = 40.49

Factor a perfect square on the left side:
(y + -5.7)(y + -5.7) = 40.49

Calculate the square root of the right side: 6.363175308

Break this problem into two subproblems by setting 
(y + -5.7) equal to 6.363175308 and -6.363175308.

Subproblem 1

y + -5.7 = 6.363175308 Simplifying y + -5.7 = 6.363175308 Reorder the terms: -5.7 + y = 6.363175308 Solving -5.7 + y = 6.363175308 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5.7' to each side of the equation. -5.7 + 5.7 + y = 6.363175308 + 5.7 Combine like terms: -5.7 + 5.7 = 0.0 0.0 + y = 6.363175308 + 5.7 y = 6.363175308 + 5.7 Combine like terms: 6.363175308 + 5.7 = 12.063175308 y = 12.063175308 Simplifying y = 12.063175308

Subproblem 2

y + -5.7 = -6.363175308 Simplifying y + -5.7 = -6.363175308 Reorder the terms: -5.7 + y = -6.363175308 Solving -5.7 + y = -6.363175308 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5.7' to each side of the equation. -5.7 + 5.7 + y = -6.363175308 + 5.7 Combine like terms: -5.7 + 5.7 = 0.0 0.0 + y = -6.363175308 + 5.7 y = -6.363175308 + 5.7 Combine like terms: -6.363175308 + 5.7 = -0.663175308 y = -0.663175308 Simplifying y = -0.663175308

Solution

The solution to the problem is based on the solutions from the subproblems. y = {12.063175308, -0.663175308}

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