15x^2+16x+3=0

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Solution for 15x^2+16x+3=0 equation:


Simplifying
15x2 + 16x + 3 = 0

Reorder the terms:
3 + 16x + 15x2 = 0

Solving
3 + 16x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
0.2 + 1.066666667x + x2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + 1.066666667x + -0.2 + x2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + 1.066666667x + x2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + 1.066666667x + x2 = 0 + -0.2
1.066666667x + x2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
1.066666667x + x2 = -0.2

The x term is 1.066666667x.  Take half its coefficient (0.5333333335).
Square it (0.2844444446) and add it to both sides.

Add '0.2844444446' to each side of the equation.
1.066666667x + 0.2844444446 + x2 = -0.2 + 0.2844444446

Reorder the terms:
0.2844444446 + 1.066666667x + x2 = -0.2 + 0.2844444446

Combine like terms: -0.2 + 0.2844444446 = 0.0844444446
0.2844444446 + 1.066666667x + x2 = 0.0844444446

Factor a perfect square on the left side:
(x + 0.5333333335)(x + 0.5333333335) = 0.0844444446

Calculate the square root of the right side: 0.290593263

Break this problem into two subproblems by setting 
(x + 0.5333333335) equal to 0.290593263 and -0.290593263.

Subproblem 1

x + 0.5333333335 = 0.290593263 Simplifying x + 0.5333333335 = 0.290593263 Reorder the terms: 0.5333333335 + x = 0.290593263 Solving 0.5333333335 + x = 0.290593263 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5333333335' to each side of the equation. 0.5333333335 + -0.5333333335 + x = 0.290593263 + -0.5333333335 Combine like terms: 0.5333333335 + -0.5333333335 = 0.0000000000 0.0000000000 + x = 0.290593263 + -0.5333333335 x = 0.290593263 + -0.5333333335 Combine like terms: 0.290593263 + -0.5333333335 = -0.2427400705 x = -0.2427400705 Simplifying x = -0.2427400705

Subproblem 2

x + 0.5333333335 = -0.290593263 Simplifying x + 0.5333333335 = -0.290593263 Reorder the terms: 0.5333333335 + x = -0.290593263 Solving 0.5333333335 + x = -0.290593263 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5333333335' to each side of the equation. 0.5333333335 + -0.5333333335 + x = -0.290593263 + -0.5333333335 Combine like terms: 0.5333333335 + -0.5333333335 = 0.0000000000 0.0000000000 + x = -0.290593263 + -0.5333333335 x = -0.290593263 + -0.5333333335 Combine like terms: -0.290593263 + -0.5333333335 = -0.8239265965 x = -0.8239265965 Simplifying x = -0.8239265965

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.2427400705, -0.8239265965}

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