7y^2+14y-5=0

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Solution for 7y^2+14y-5=0 equation:


Simplifying
7y2 + 14y + -5 = 0

Reorder the terms:
-5 + 14y + 7y2 = 0

Solving
-5 + 14y + 7y2 = 0

Solving for variable 'y'.

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

Divide each side by '7'.
-0.7142857143 + 2y + y2 = 0

Move the constant term to the right:

Add '0.7142857143' to each side of the equation.
-0.7142857143 + 2y + 0.7142857143 + y2 = 0 + 0.7142857143

Reorder the terms:
-0.7142857143 + 0.7142857143 + 2y + y2 = 0 + 0.7142857143

Combine like terms: -0.7142857143 + 0.7142857143 = 0.0000000000
0.0000000000 + 2y + y2 = 0 + 0.7142857143
2y + y2 = 0 + 0.7142857143

Combine like terms: 0 + 0.7142857143 = 0.7142857143
2y + y2 = 0.7142857143

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 0.7142857143 + 1

Reorder the terms:
1 + 2y + y2 = 0.7142857143 + 1

Combine like terms: 0.7142857143 + 1 = 1.7142857143
1 + 2y + y2 = 1.7142857143

Factor a perfect square on the left side:
(y + 1)(y + 1) = 1.7142857143

Calculate the square root of the right side: 1.309307341

Break this problem into two subproblems by setting 
(y + 1) equal to 1.309307341 and -1.309307341.

Subproblem 1

y + 1 = 1.309307341 Simplifying y + 1 = 1.309307341 Reorder the terms: 1 + y = 1.309307341 Solving 1 + y = 1.309307341 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 1.309307341 + -1 Combine like terms: 1 + -1 = 0 0 + y = 1.309307341 + -1 y = 1.309307341 + -1 Combine like terms: 1.309307341 + -1 = 0.309307341 y = 0.309307341 Simplifying y = 0.309307341

Subproblem 2

y + 1 = -1.309307341 Simplifying y + 1 = -1.309307341 Reorder the terms: 1 + y = -1.309307341 Solving 1 + y = -1.309307341 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -1.309307341 + -1 Combine like terms: 1 + -1 = 0 0 + y = -1.309307341 + -1 y = -1.309307341 + -1 Combine like terms: -1.309307341 + -1 = -2.309307341 y = -2.309307341 Simplifying y = -2.309307341

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.309307341, -2.309307341}

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