4y^2+15y+2=0

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Solution for 4y^2+15y+2=0 equation:


Simplifying
4y2 + 15y + 2 = 0

Reorder the terms:
2 + 15y + 4y2 = 0

Solving
2 + 15y + 4y2 = 0

Solving for variable 'y'.

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

Divide each side by '4'.
0.5 + 3.75y + y2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 3.75y + -0.5 + y2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 3.75y + y2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 3.75y + y2 = 0 + -0.5
3.75y + y2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
3.75y + y2 = -0.5

The y term is 3.75y.  Take half its coefficient (1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
3.75y + 3.515625 + y2 = -0.5 + 3.515625

Reorder the terms:
3.515625 + 3.75y + y2 = -0.5 + 3.515625

Combine like terms: -0.5 + 3.515625 = 3.015625
3.515625 + 3.75y + y2 = 3.015625

Factor a perfect square on the left side:
(y + 1.875)(y + 1.875) = 3.015625

Calculate the square root of the right side: 1.736555499

Break this problem into two subproblems by setting 
(y + 1.875) equal to 1.736555499 and -1.736555499.

Subproblem 1

y + 1.875 = 1.736555499 Simplifying y + 1.875 = 1.736555499 Reorder the terms: 1.875 + y = 1.736555499 Solving 1.875 + y = 1.736555499 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.875' to each side of the equation. 1.875 + -1.875 + y = 1.736555499 + -1.875 Combine like terms: 1.875 + -1.875 = 0.000 0.000 + y = 1.736555499 + -1.875 y = 1.736555499 + -1.875 Combine like terms: 1.736555499 + -1.875 = -0.138444501 y = -0.138444501 Simplifying y = -0.138444501

Subproblem 2

y + 1.875 = -1.736555499 Simplifying y + 1.875 = -1.736555499 Reorder the terms: 1.875 + y = -1.736555499 Solving 1.875 + y = -1.736555499 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.875' to each side of the equation. 1.875 + -1.875 + y = -1.736555499 + -1.875 Combine like terms: 1.875 + -1.875 = 0.000 0.000 + y = -1.736555499 + -1.875 y = -1.736555499 + -1.875 Combine like terms: -1.736555499 + -1.875 = -3.611555499 y = -3.611555499 Simplifying y = -3.611555499

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.138444501, -3.611555499}

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