6x^2+15x+1=0

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Solution for 6x^2+15x+1=0 equation:


Simplifying
6x2 + 15x + 1 = 0

Reorder the terms:
1 + 15x + 6x2 = 0

Solving
1 + 15x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
0.1666666667 + 2.5x + x2 = 0

Move the constant term to the right:

Add '-0.1666666667' to each side of the equation.
0.1666666667 + 2.5x + -0.1666666667 + x2 = 0 + -0.1666666667

Reorder the terms:
0.1666666667 + -0.1666666667 + 2.5x + x2 = 0 + -0.1666666667

Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000
0.0000000000 + 2.5x + x2 = 0 + -0.1666666667
2.5x + x2 = 0 + -0.1666666667

Combine like terms: 0 + -0.1666666667 = -0.1666666667
2.5x + x2 = -0.1666666667

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = -0.1666666667 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = -0.1666666667 + 1.5625

Combine like terms: -0.1666666667 + 1.5625 = 1.3958333333
1.5625 + 2.5x + x2 = 1.3958333333

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 1.3958333333

Calculate the square root of the right side: 1.181453907

Break this problem into two subproblems by setting 
(x + 1.25) equal to 1.181453907 and -1.181453907.

Subproblem 1

x + 1.25 = 1.181453907 Simplifying x + 1.25 = 1.181453907 Reorder the terms: 1.25 + x = 1.181453907 Solving 1.25 + x = 1.181453907 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 1.181453907 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 1.181453907 + -1.25 x = 1.181453907 + -1.25 Combine like terms: 1.181453907 + -1.25 = -0.068546093 x = -0.068546093 Simplifying x = -0.068546093

Subproblem 2

x + 1.25 = -1.181453907 Simplifying x + 1.25 = -1.181453907 Reorder the terms: 1.25 + x = -1.181453907 Solving 1.25 + x = -1.181453907 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -1.181453907 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -1.181453907 + -1.25 x = -1.181453907 + -1.25 Combine like terms: -1.181453907 + -1.25 = -2.431453907 x = -2.431453907 Simplifying x = -2.431453907

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.068546093, -2.431453907}

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