5x^2+12x+3=0

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Solution for 5x^2+12x+3=0 equation:


Simplifying
5x2 + 12x + 3 = 0

Reorder the terms:
3 + 12x + 5x2 = 0

Solving
3 + 12x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
0.6 + 2.4x + x2 = 0

Move the constant term to the right:

Add '-0.6' to each side of the equation.
0.6 + 2.4x + -0.6 + x2 = 0 + -0.6

Reorder the terms:
0.6 + -0.6 + 2.4x + x2 = 0 + -0.6

Combine like terms: 0.6 + -0.6 = 0.0
0.0 + 2.4x + x2 = 0 + -0.6
2.4x + x2 = 0 + -0.6

Combine like terms: 0 + -0.6 = -0.6
2.4x + x2 = -0.6

The x term is 2.4x.  Take half its coefficient (1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
2.4x + 1.44 + x2 = -0.6 + 1.44

Reorder the terms:
1.44 + 2.4x + x2 = -0.6 + 1.44

Combine like terms: -0.6 + 1.44 = 0.84
1.44 + 2.4x + x2 = 0.84

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 0.84

Calculate the square root of the right side: 0.916515139

Break this problem into two subproblems by setting 
(x + 1.2) equal to 0.916515139 and -0.916515139.

Subproblem 1

x + 1.2 = 0.916515139 Simplifying x + 1.2 = 0.916515139 Reorder the terms: 1.2 + x = 0.916515139 Solving 1.2 + x = 0.916515139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = 0.916515139 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 0.916515139 + -1.2 x = 0.916515139 + -1.2 Combine like terms: 0.916515139 + -1.2 = -0.283484861 x = -0.283484861 Simplifying x = -0.283484861

Subproblem 2

x + 1.2 = -0.916515139 Simplifying x + 1.2 = -0.916515139 Reorder the terms: 1.2 + x = -0.916515139 Solving 1.2 + x = -0.916515139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = -0.916515139 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -0.916515139 + -1.2 x = -0.916515139 + -1.2 Combine like terms: -0.916515139 + -1.2 = -2.116515139 x = -2.116515139 Simplifying x = -2.116515139

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.283484861, -2.116515139}

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