5y^2-4y-56=0

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Solution for 5y^2-4y-56=0 equation:


Simplifying
5y2 + -4y + -56 = 0

Reorder the terms:
-56 + -4y + 5y2 = 0

Solving
-56 + -4y + 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'.
-11.2 + -0.8y + y2 = 0

Move the constant term to the right:

Add '11.2' to each side of the equation.
-11.2 + -0.8y + 11.2 + y2 = 0 + 11.2

Reorder the terms:
-11.2 + 11.2 + -0.8y + y2 = 0 + 11.2

Combine like terms: -11.2 + 11.2 = 0.0
0.0 + -0.8y + y2 = 0 + 11.2
-0.8y + y2 = 0 + 11.2

Combine like terms: 0 + 11.2 = 11.2
-0.8y + y2 = 11.2

The y term is -0.8y.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8y + 0.16 + y2 = 11.2 + 0.16

Reorder the terms:
0.16 + -0.8y + y2 = 11.2 + 0.16

Combine like terms: 11.2 + 0.16 = 11.36
0.16 + -0.8y + y2 = 11.36

Factor a perfect square on the left side:
(y + -0.4)(y + -0.4) = 11.36

Calculate the square root of the right side: 3.370459909

Break this problem into two subproblems by setting 
(y + -0.4) equal to 3.370459909 and -3.370459909.

Subproblem 1

y + -0.4 = 3.370459909 Simplifying y + -0.4 = 3.370459909 Reorder the terms: -0.4 + y = 3.370459909 Solving -0.4 + y = 3.370459909 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + y = 3.370459909 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + y = 3.370459909 + 0.4 y = 3.370459909 + 0.4 Combine like terms: 3.370459909 + 0.4 = 3.770459909 y = 3.770459909 Simplifying y = 3.770459909

Subproblem 2

y + -0.4 = -3.370459909 Simplifying y + -0.4 = -3.370459909 Reorder the terms: -0.4 + y = -3.370459909 Solving -0.4 + y = -3.370459909 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + y = -3.370459909 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + y = -3.370459909 + 0.4 y = -3.370459909 + 0.4 Combine like terms: -3.370459909 + 0.4 = -2.970459909 y = -2.970459909 Simplifying y = -2.970459909

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.770459909, -2.970459909}

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