12x^2+15x+4=0

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Solution for 12x^2+15x+4=0 equation:


Simplifying
12x2 + 15x + 4 = 0

Reorder the terms:
4 + 15x + 12x2 = 0

Solving
4 + 15x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
0.3333333333 + 1.25x + x2 = 0

Move the constant term to the right:

Add '-0.3333333333' to each side of the equation.
0.3333333333 + 1.25x + -0.3333333333 + x2 = 0 + -0.3333333333

Reorder the terms:
0.3333333333 + -0.3333333333 + 1.25x + x2 = 0 + -0.3333333333

Combine like terms: 0.3333333333 + -0.3333333333 = 0.0000000000
0.0000000000 + 1.25x + x2 = 0 + -0.3333333333
1.25x + x2 = 0 + -0.3333333333

Combine like terms: 0 + -0.3333333333 = -0.3333333333
1.25x + x2 = -0.3333333333

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = -0.3333333333 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = -0.3333333333 + 0.390625

Combine like terms: -0.3333333333 + 0.390625 = 0.0572916667
0.390625 + 1.25x + x2 = 0.0572916667

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 0.0572916667

Calculate the square root of the right side: 0.239356777

Break this problem into two subproblems by setting 
(x + 0.625) equal to 0.239356777 and -0.239356777.

Subproblem 1

x + 0.625 = 0.239356777 Simplifying x + 0.625 = 0.239356777 Reorder the terms: 0.625 + x = 0.239356777 Solving 0.625 + x = 0.239356777 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 0.239356777 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 0.239356777 + -0.625 x = 0.239356777 + -0.625 Combine like terms: 0.239356777 + -0.625 = -0.385643223 x = -0.385643223 Simplifying x = -0.385643223

Subproblem 2

x + 0.625 = -0.239356777 Simplifying x + 0.625 = -0.239356777 Reorder the terms: 0.625 + x = -0.239356777 Solving 0.625 + x = -0.239356777 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -0.239356777 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -0.239356777 + -0.625 x = -0.239356777 + -0.625 Combine like terms: -0.239356777 + -0.625 = -0.864356777 x = -0.864356777 Simplifying x = -0.864356777

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.385643223, -0.864356777}

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