7y^2-3y-2=-5y

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Solution for 7y^2-3y-2=-5y equation:


Simplifying
7y2 + -3y + -2 = -5y

Reorder the terms:
-2 + -3y + 7y2 = -5y

Solving
-2 + -3y + 7y2 = -5y

Solving for variable 'y'.

Reorder the terms:
-2 + -3y + 5y + 7y2 = -5y + 5y

Combine like terms: -3y + 5y = 2y
-2 + 2y + 7y2 = -5y + 5y

Combine like terms: -5y + 5y = 0
-2 + 2y + 7y2 = 0

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

Divide each side by '7'.
-0.2857142857 + 0.2857142857y + y2 = 0

Move the constant term to the right:

Add '0.2857142857' to each side of the equation.
-0.2857142857 + 0.2857142857y + 0.2857142857 + y2 = 0 + 0.2857142857

Reorder the terms:
-0.2857142857 + 0.2857142857 + 0.2857142857y + y2 = 0 + 0.2857142857

Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000
0.0000000000 + 0.2857142857y + y2 = 0 + 0.2857142857
0.2857142857y + y2 = 0 + 0.2857142857

Combine like terms: 0 + 0.2857142857 = 0.2857142857
0.2857142857y + y2 = 0.2857142857

The y term is 0.2857142857y.  Take half its coefficient (0.1428571429).
Square it (0.02040816328) and add it to both sides.

Add '0.02040816328' to each side of the equation.
0.2857142857y + 0.02040816328 + y2 = 0.2857142857 + 0.02040816328

Reorder the terms:
0.02040816328 + 0.2857142857y + y2 = 0.2857142857 + 0.02040816328

Combine like terms: 0.2857142857 + 0.02040816328 = 0.30612244898
0.02040816328 + 0.2857142857y + y2 = 0.30612244898

Factor a perfect square on the left side:
(y + 0.1428571429)(y + 0.1428571429) = 0.30612244898

Calculate the square root of the right side: 0.553283335

Break this problem into two subproblems by setting 
(y + 0.1428571429) equal to 0.553283335 and -0.553283335.

Subproblem 1

y + 0.1428571429 = 0.553283335 Simplifying y + 0.1428571429 = 0.553283335 Reorder the terms: 0.1428571429 + y = 0.553283335 Solving 0.1428571429 + y = 0.553283335 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.1428571429' to each side of the equation. 0.1428571429 + -0.1428571429 + y = 0.553283335 + -0.1428571429 Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000 0.0000000000 + y = 0.553283335 + -0.1428571429 y = 0.553283335 + -0.1428571429 Combine like terms: 0.553283335 + -0.1428571429 = 0.4104261921 y = 0.4104261921 Simplifying y = 0.4104261921

Subproblem 2

y + 0.1428571429 = -0.553283335 Simplifying y + 0.1428571429 = -0.553283335 Reorder the terms: 0.1428571429 + y = -0.553283335 Solving 0.1428571429 + y = -0.553283335 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.1428571429' to each side of the equation. 0.1428571429 + -0.1428571429 + y = -0.553283335 + -0.1428571429 Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000 0.0000000000 + y = -0.553283335 + -0.1428571429 y = -0.553283335 + -0.1428571429 Combine like terms: -0.553283335 + -0.1428571429 = -0.6961404779 y = -0.6961404779 Simplifying y = -0.6961404779

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.4104261921, -0.6961404779}

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