10y^2+15y+4=0

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Solution for 10y^2+15y+4=0 equation:


Simplifying
10y2 + 15y + 4 = 0

Reorder the terms:
4 + 15y + 10y2 = 0

Solving
4 + 15y + 10y2 = 0

Solving for variable 'y'.

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

Divide each side by '10'.
0.4 + 1.5y + y2 = 0

Move the constant term to the right:

Add '-0.4' to each side of the equation.
0.4 + 1.5y + -0.4 + y2 = 0 + -0.4

Reorder the terms:
0.4 + -0.4 + 1.5y + y2 = 0 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + 1.5y + y2 = 0 + -0.4
1.5y + y2 = 0 + -0.4

Combine like terms: 0 + -0.4 = -0.4
1.5y + y2 = -0.4

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 = -0.4 + 0.5625

Reorder the terms:
0.5625 + 1.5y + y2 = -0.4 + 0.5625

Combine like terms: -0.4 + 0.5625 = 0.1625
0.5625 + 1.5y + y2 = 0.1625

Factor a perfect square on the left side:
(y + 0.75)(y + 0.75) = 0.1625

Calculate the square root of the right side: 0.403112887

Break this problem into two subproblems by setting 
(y + 0.75) equal to 0.403112887 and -0.403112887.

Subproblem 1

y + 0.75 = 0.403112887 Simplifying y + 0.75 = 0.403112887 Reorder the terms: 0.75 + y = 0.403112887 Solving 0.75 + y = 0.403112887 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 = 0.403112887 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + y = 0.403112887 + -0.75 y = 0.403112887 + -0.75 Combine like terms: 0.403112887 + -0.75 = -0.346887113 y = -0.346887113 Simplifying y = -0.346887113

Subproblem 2

y + 0.75 = -0.403112887 Simplifying y + 0.75 = -0.403112887 Reorder the terms: 0.75 + y = -0.403112887 Solving 0.75 + y = -0.403112887 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 = -0.403112887 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + y = -0.403112887 + -0.75 y = -0.403112887 + -0.75 Combine like terms: -0.403112887 + -0.75 = -1.153112887 y = -1.153112887 Simplifying y = -1.153112887

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.346887113, -1.153112887}

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