-2y^2-10y+3=0

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Solution for -2y^2-10y+3=0 equation:


Simplifying
-2y2 + -10y + 3 = 0

Reorder the terms:
3 + -10y + -2y2 = 0

Solving
3 + -10y + -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'.
-1.5 + 5y + y2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 5y + 1.5 + y2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 5y + y2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 5y + y2 = 0 + 1.5
5y + y2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
5y + y2 = 1.5

The y term is 5y.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5y + 6.25 + y2 = 1.5 + 6.25

Reorder the terms:
6.25 + 5y + y2 = 1.5 + 6.25

Combine like terms: 1.5 + 6.25 = 7.75
6.25 + 5y + y2 = 7.75

Factor a perfect square on the left side:
(y + 2.5)(y + 2.5) = 7.75

Calculate the square root of the right side: 2.783882181

Break this problem into two subproblems by setting 
(y + 2.5) equal to 2.783882181 and -2.783882181.

Subproblem 1

y + 2.5 = 2.783882181 Simplifying y + 2.5 = 2.783882181 Reorder the terms: 2.5 + y = 2.783882181 Solving 2.5 + y = 2.783882181 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + y = 2.783882181 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y = 2.783882181 + -2.5 y = 2.783882181 + -2.5 Combine like terms: 2.783882181 + -2.5 = 0.283882181 y = 0.283882181 Simplifying y = 0.283882181

Subproblem 2

y + 2.5 = -2.783882181 Simplifying y + 2.5 = -2.783882181 Reorder the terms: 2.5 + y = -2.783882181 Solving 2.5 + y = -2.783882181 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + y = -2.783882181 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y = -2.783882181 + -2.5 y = -2.783882181 + -2.5 Combine like terms: -2.783882181 + -2.5 = -5.283882181 y = -5.283882181 Simplifying y = -5.283882181

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.283882181, -5.283882181}

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