5y^2+8y-8=0

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Solution for 5y^2+8y-8=0 equation:


Simplifying
5y2 + 8y + -8 = 0

Reorder the terms:
-8 + 8y + 5y2 = 0

Solving
-8 + 8y + 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'.
-1.6 + 1.6y + y2 = 0

Move the constant term to the right:

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

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

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

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

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 = 1.6 + 0.64

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

Combine like terms: 1.6 + 0.64 = 2.24
0.64 + 1.6y + y2 = 2.24

Factor a perfect square on the left side:
(y + 0.8)(y + 0.8) = 2.24

Calculate the square root of the right side: 1.496662955

Break this problem into two subproblems by setting 
(y + 0.8) equal to 1.496662955 and -1.496662955.

Subproblem 1

y + 0.8 = 1.496662955 Simplifying y + 0.8 = 1.496662955 Reorder the terms: 0.8 + y = 1.496662955 Solving 0.8 + y = 1.496662955 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 = 1.496662955 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + y = 1.496662955 + -0.8 y = 1.496662955 + -0.8 Combine like terms: 1.496662955 + -0.8 = 0.696662955 y = 0.696662955 Simplifying y = 0.696662955

Subproblem 2

y + 0.8 = -1.496662955 Simplifying y + 0.8 = -1.496662955 Reorder the terms: 0.8 + y = -1.496662955 Solving 0.8 + y = -1.496662955 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 = -1.496662955 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + y = -1.496662955 + -0.8 y = -1.496662955 + -0.8 Combine like terms: -1.496662955 + -0.8 = -2.296662955 y = -2.296662955 Simplifying y = -2.296662955

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.696662955, -2.296662955}

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