5*y^2-7*y-2=0

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Solution for 5*y^2-7*y-2=0 equation:


Simplifying
5y2 + -7y + -2 = 0

Reorder the terms:
-2 + -7y + 5y2 = 0

Solving
-2 + -7y + 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'.
-0.4 + -1.4y + y2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -1.4y + 0.4 + y2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -1.4y + y2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -1.4y + y2 = 0 + 0.4
-1.4y + y2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-1.4y + y2 = 0.4

The y term is -1.4y.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4y + 0.49 + y2 = 0.4 + 0.49

Reorder the terms:
0.49 + -1.4y + y2 = 0.4 + 0.49

Combine like terms: 0.4 + 0.49 = 0.89
0.49 + -1.4y + y2 = 0.89

Factor a perfect square on the left side:
(y + -0.7)(y + -0.7) = 0.89

Calculate the square root of the right side: 0.943398113

Break this problem into two subproblems by setting 
(y + -0.7) equal to 0.943398113 and -0.943398113.

Subproblem 1

y + -0.7 = 0.943398113 Simplifying y + -0.7 = 0.943398113 Reorder the terms: -0.7 + y = 0.943398113 Solving -0.7 + y = 0.943398113 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + y = 0.943398113 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + y = 0.943398113 + 0.7 y = 0.943398113 + 0.7 Combine like terms: 0.943398113 + 0.7 = 1.643398113 y = 1.643398113 Simplifying y = 1.643398113

Subproblem 2

y + -0.7 = -0.943398113 Simplifying y + -0.7 = -0.943398113 Reorder the terms: -0.7 + y = -0.943398113 Solving -0.7 + y = -0.943398113 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + y = -0.943398113 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + y = -0.943398113 + 0.7 y = -0.943398113 + 0.7 Combine like terms: -0.943398113 + 0.7 = -0.243398113 y = -0.243398113 Simplifying y = -0.243398113

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.643398113, -0.243398113}

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