5y^2+3y^2+25y+15=0

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Solution for 5y^2+3y^2+25y+15=0 equation:


Simplifying
5y2 + 3y2 + 25y + 15 = 0

Reorder the terms:
15 + 25y + 5y2 + 3y2 = 0

Combine like terms: 5y2 + 3y2 = 8y2
15 + 25y + 8y2 = 0

Solving
15 + 25y + 8y2 = 0

Solving for variable 'y'.

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

Divide each side by '8'.
1.875 + 3.125y + y2 = 0

Move the constant term to the right:

Add '-1.875' to each side of the equation.
1.875 + 3.125y + -1.875 + y2 = 0 + -1.875

Reorder the terms:
1.875 + -1.875 + 3.125y + y2 = 0 + -1.875

Combine like terms: 1.875 + -1.875 = 0.000
0.000 + 3.125y + y2 = 0 + -1.875
3.125y + y2 = 0 + -1.875

Combine like terms: 0 + -1.875 = -1.875
3.125y + y2 = -1.875

The y term is 3.125y.  Take half its coefficient (1.5625).
Square it (2.44140625) and add it to both sides.

Add '2.44140625' to each side of the equation.
3.125y + 2.44140625 + y2 = -1.875 + 2.44140625

Reorder the terms:
2.44140625 + 3.125y + y2 = -1.875 + 2.44140625

Combine like terms: -1.875 + 2.44140625 = 0.56640625
2.44140625 + 3.125y + y2 = 0.56640625

Factor a perfect square on the left side:
(y + 1.5625)(y + 1.5625) = 0.56640625

Calculate the square root of the right side: 0.752599661

Break this problem into two subproblems by setting 
(y + 1.5625) equal to 0.752599661 and -0.752599661.

Subproblem 1

y + 1.5625 = 0.752599661 Simplifying y + 1.5625 = 0.752599661 Reorder the terms: 1.5625 + y = 0.752599661 Solving 1.5625 + y = 0.752599661 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5625' to each side of the equation. 1.5625 + -1.5625 + y = 0.752599661 + -1.5625 Combine like terms: 1.5625 + -1.5625 = 0.0000 0.0000 + y = 0.752599661 + -1.5625 y = 0.752599661 + -1.5625 Combine like terms: 0.752599661 + -1.5625 = -0.809900339 y = -0.809900339 Simplifying y = -0.809900339

Subproblem 2

y + 1.5625 = -0.752599661 Simplifying y + 1.5625 = -0.752599661 Reorder the terms: 1.5625 + y = -0.752599661 Solving 1.5625 + y = -0.752599661 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5625' to each side of the equation. 1.5625 + -1.5625 + y = -0.752599661 + -1.5625 Combine like terms: 1.5625 + -1.5625 = 0.0000 0.0000 + y = -0.752599661 + -1.5625 y = -0.752599661 + -1.5625 Combine like terms: -0.752599661 + -1.5625 = -2.315099661 y = -2.315099661 Simplifying y = -2.315099661

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.809900339, -2.315099661}

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