8y^2+12y+3=0

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Solution for 8y^2+12y+3=0 equation:


Simplifying
8y2 + 12y + 3 = 0

Reorder the terms:
3 + 12y + 8y2 = 0

Solving
3 + 12y + 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'.
0.375 + 1.5y + y2 = 0

Move the constant term to the right:

Add '-0.375' to each side of the equation.
0.375 + 1.5y + -0.375 + y2 = 0 + -0.375

Reorder the terms:
0.375 + -0.375 + 1.5y + y2 = 0 + -0.375

Combine like terms: 0.375 + -0.375 = 0.000
0.000 + 1.5y + y2 = 0 + -0.375
1.5y + y2 = 0 + -0.375

Combine like terms: 0 + -0.375 = -0.375
1.5y + y2 = -0.375

The y term is 1.5y.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5y + 0.5625 + y2 = -0.375 + 0.5625

Reorder the terms:
0.5625 + 1.5y + y2 = -0.375 + 0.5625

Combine like terms: -0.375 + 0.5625 = 0.1875
0.5625 + 1.5y + y2 = 0.1875

Factor a perfect square on the left side:
(y + 0.75)(y + 0.75) = 0.1875

Calculate the square root of the right side: 0.433012702

Break this problem into two subproblems by setting 
(y + 0.75) equal to 0.433012702 and -0.433012702.

Subproblem 1

y + 0.75 = 0.433012702 Simplifying y + 0.75 = 0.433012702 Reorder the terms: 0.75 + y = 0.433012702 Solving 0.75 + y = 0.433012702 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + y = 0.433012702 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + y = 0.433012702 + -0.75 y = 0.433012702 + -0.75 Combine like terms: 0.433012702 + -0.75 = -0.316987298 y = -0.316987298 Simplifying y = -0.316987298

Subproblem 2

y + 0.75 = -0.433012702 Simplifying y + 0.75 = -0.433012702 Reorder the terms: 0.75 + y = -0.433012702 Solving 0.75 + y = -0.433012702 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + y = -0.433012702 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + y = -0.433012702 + -0.75 y = -0.433012702 + -0.75 Combine like terms: -0.433012702 + -0.75 = -1.183012702 y = -1.183012702 Simplifying y = -1.183012702

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.316987298, -1.183012702}

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