5y^2+6y-140=0

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Solution for 5y^2+6y-140=0 equation:


Simplifying
5y2 + 6y + -140 = 0

Reorder the terms:
-140 + 6y + 5y2 = 0

Solving
-140 + 6y + 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'.
-28 + 1.2y + y2 = 0

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + 1.2y + 28 + y2 = 0 + 28

Reorder the terms:
-28 + 28 + 1.2y + y2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 1.2y + y2 = 0 + 28
1.2y + y2 = 0 + 28

Combine like terms: 0 + 28 = 28
1.2y + y2 = 28

The y term is 1.2y.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2y + 0.36 + y2 = 28 + 0.36

Reorder the terms:
0.36 + 1.2y + y2 = 28 + 0.36

Combine like terms: 28 + 0.36 = 28.36
0.36 + 1.2y + y2 = 28.36

Factor a perfect square on the left side:
(y + 0.6)(y + 0.6) = 28.36

Calculate the square root of the right side: 5.325410782

Break this problem into two subproblems by setting 
(y + 0.6) equal to 5.325410782 and -5.325410782.

Subproblem 1

y + 0.6 = 5.325410782 Simplifying y + 0.6 = 5.325410782 Reorder the terms: 0.6 + y = 5.325410782 Solving 0.6 + y = 5.325410782 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + y = 5.325410782 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + y = 5.325410782 + -0.6 y = 5.325410782 + -0.6 Combine like terms: 5.325410782 + -0.6 = 4.725410782 y = 4.725410782 Simplifying y = 4.725410782

Subproblem 2

y + 0.6 = -5.325410782 Simplifying y + 0.6 = -5.325410782 Reorder the terms: 0.6 + y = -5.325410782 Solving 0.6 + y = -5.325410782 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + y = -5.325410782 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + y = -5.325410782 + -0.6 y = -5.325410782 + -0.6 Combine like terms: -5.325410782 + -0.6 = -5.925410782 y = -5.925410782 Simplifying y = -5.925410782

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.725410782, -5.925410782}

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