2Y^2+15Y+10=0

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Solution for 2Y^2+15Y+10=0 equation:


Simplifying
2Y2 + 15Y + 10 = 0

Reorder the terms:
10 + 15Y + 2Y2 = 0

Solving
10 + 15Y + 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'.
5 + 7.5Y + Y2 = 0

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + 7.5Y + -5 + Y2 = 0 + -5

Reorder the terms:
5 + -5 + 7.5Y + Y2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 7.5Y + Y2 = 0 + -5
7.5Y + Y2 = 0 + -5

Combine like terms: 0 + -5 = -5
7.5Y + Y2 = -5

The Y term is 7.5Y.  Take half its coefficient (3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
7.5Y + 14.0625 + Y2 = -5 + 14.0625

Reorder the terms:
14.0625 + 7.5Y + Y2 = -5 + 14.0625

Combine like terms: -5 + 14.0625 = 9.0625
14.0625 + 7.5Y + Y2 = 9.0625

Factor a perfect square on the left side:
(Y + 3.75)(Y + 3.75) = 9.0625

Calculate the square root of the right side: 3.010398645

Break this problem into two subproblems by setting 
(Y + 3.75) equal to 3.010398645 and -3.010398645.

Subproblem 1

Y + 3.75 = 3.010398645 Simplifying Y + 3.75 = 3.010398645 Reorder the terms: 3.75 + Y = 3.010398645 Solving 3.75 + Y = 3.010398645 Solving for variable 'Y'. Move all terms containing Y to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + Y = 3.010398645 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + Y = 3.010398645 + -3.75 Y = 3.010398645 + -3.75 Combine like terms: 3.010398645 + -3.75 = -0.739601355 Y = -0.739601355 Simplifying Y = -0.739601355

Subproblem 2

Y + 3.75 = -3.010398645 Simplifying Y + 3.75 = -3.010398645 Reorder the terms: 3.75 + Y = -3.010398645 Solving 3.75 + Y = -3.010398645 Solving for variable 'Y'. Move all terms containing Y to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + Y = -3.010398645 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + Y = -3.010398645 + -3.75 Y = -3.010398645 + -3.75 Combine like terms: -3.010398645 + -3.75 = -6.760398645 Y = -6.760398645 Simplifying Y = -6.760398645

Solution

The solution to the problem is based on the solutions from the subproblems. Y = {-0.739601355, -6.760398645}

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