-2y^2-14y+7=0

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


Simplifying
-2y2 + -14y + 7 = 0

Reorder the terms:
7 + -14y + -2y2 = 0

Solving
7 + -14y + -2y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-3.5 + 7y + y2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + 7y + 3.5 + y2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + 7y + y2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + 7y + y2 = 0 + 3.5
7y + y2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
7y + y2 = 3.5

The y term is 7y.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7y + 12.25 + y2 = 3.5 + 12.25

Reorder the terms:
12.25 + 7y + y2 = 3.5 + 12.25

Combine like terms: 3.5 + 12.25 = 15.75
12.25 + 7y + y2 = 15.75

Factor a perfect square on the left side:
(y + 3.5)(y + 3.5) = 15.75

Calculate the square root of the right side: 3.968626967

Break this problem into two subproblems by setting 
(y + 3.5) equal to 3.968626967 and -3.968626967.

Subproblem 1

y + 3.5 = 3.968626967 Simplifying y + 3.5 = 3.968626967 Reorder the terms: 3.5 + y = 3.968626967 Solving 3.5 + y = 3.968626967 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + y = 3.968626967 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = 3.968626967 + -3.5 y = 3.968626967 + -3.5 Combine like terms: 3.968626967 + -3.5 = 0.468626967 y = 0.468626967 Simplifying y = 0.468626967

Subproblem 2

y + 3.5 = -3.968626967 Simplifying y + 3.5 = -3.968626967 Reorder the terms: 3.5 + y = -3.968626967 Solving 3.5 + y = -3.968626967 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + y = -3.968626967 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + y = -3.968626967 + -3.5 y = -3.968626967 + -3.5 Combine like terms: -3.968626967 + -3.5 = -7.468626967 y = -7.468626967 Simplifying y = -7.468626967

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.468626967, -7.468626967}

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