5(y)(y)-8y=2

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Solution for 5(y)(y)-8y=2 equation:


Simplifying
5(y)(y) + -8y = 2

Multiply y * y
5y2 + -8y = 2

Reorder the terms:
-8y + 5y2 = 2

Solving
-8y + 5y2 = 2

Solving for variable 'y'.

Reorder the terms:
-2 + -8y + 5y2 = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + -8y + 5y2 = 0

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

Divide each side by '5'.
-0.4 + -1.6y + y2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -1.6y + 0.4 + y2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -1.6y + y2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -1.6y + y2 = 0 + 0.4
-1.6y + y2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-1.6y + y2 = 0.4

The y term is -1.6y.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6y + 0.64 + y2 = 0.4 + 0.64

Reorder the terms:
0.64 + -1.6y + y2 = 0.4 + 0.64

Combine like terms: 0.4 + 0.64 = 1.04
0.64 + -1.6y + y2 = 1.04

Factor a perfect square on the left side:
(y + -0.8)(y + -0.8) = 1.04

Calculate the square root of the right side: 1.019803903

Break this problem into two subproblems by setting 
(y + -0.8) equal to 1.019803903 and -1.019803903.

Subproblem 1

y + -0.8 = 1.019803903 Simplifying y + -0.8 = 1.019803903 Reorder the terms: -0.8 + y = 1.019803903 Solving -0.8 + y = 1.019803903 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + y = 1.019803903 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + y = 1.019803903 + 0.8 y = 1.019803903 + 0.8 Combine like terms: 1.019803903 + 0.8 = 1.819803903 y = 1.819803903 Simplifying y = 1.819803903

Subproblem 2

y + -0.8 = -1.019803903 Simplifying y + -0.8 = -1.019803903 Reorder the terms: -0.8 + y = -1.019803903 Solving -0.8 + y = -1.019803903 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + y = -1.019803903 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + y = -1.019803903 + 0.8 y = -1.019803903 + 0.8 Combine like terms: -1.019803903 + 0.8 = -0.219803903 y = -0.219803903 Simplifying y = -0.219803903

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.819803903, -0.219803903}

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