6a^2-15a-1=0

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Solution for 6a^2-15a-1=0 equation:


Simplifying
6a2 + -15a + -1 = 0

Reorder the terms:
-1 + -15a + 6a2 = 0

Solving
-1 + -15a + 6a2 = 0

Solving for variable 'a'.

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

Divide each side by '6'.
-0.1666666667 + -2.5a + a2 = 0

Move the constant term to the right:

Add '0.1666666667' to each side of the equation.
-0.1666666667 + -2.5a + 0.1666666667 + a2 = 0 + 0.1666666667

Reorder the terms:
-0.1666666667 + 0.1666666667 + -2.5a + a2 = 0 + 0.1666666667

Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000
0.0000000000 + -2.5a + a2 = 0 + 0.1666666667
-2.5a + a2 = 0 + 0.1666666667

Combine like terms: 0 + 0.1666666667 = 0.1666666667
-2.5a + a2 = 0.1666666667

The a term is -2.5a.  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.
-2.5a + 1.5625 + a2 = 0.1666666667 + 1.5625

Reorder the terms:
1.5625 + -2.5a + a2 = 0.1666666667 + 1.5625

Combine like terms: 0.1666666667 + 1.5625 = 1.7291666667
1.5625 + -2.5a + a2 = 1.7291666667

Factor a perfect square on the left side:
(a + -1.25)(a + -1.25) = 1.7291666667

Calculate the square root of the right side: 1.31497782

Break this problem into two subproblems by setting 
(a + -1.25) equal to 1.31497782 and -1.31497782.

Subproblem 1

a + -1.25 = 1.31497782 Simplifying a + -1.25 = 1.31497782 Reorder the terms: -1.25 + a = 1.31497782 Solving -1.25 + a = 1.31497782 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + a = 1.31497782 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + a = 1.31497782 + 1.25 a = 1.31497782 + 1.25 Combine like terms: 1.31497782 + 1.25 = 2.56497782 a = 2.56497782 Simplifying a = 2.56497782

Subproblem 2

a + -1.25 = -1.31497782 Simplifying a + -1.25 = -1.31497782 Reorder the terms: -1.25 + a = -1.31497782 Solving -1.25 + a = -1.31497782 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + a = -1.31497782 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + a = -1.31497782 + 1.25 a = -1.31497782 + 1.25 Combine like terms: -1.31497782 + 1.25 = -0.06497782 a = -0.06497782 Simplifying a = -0.06497782

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.56497782, -0.06497782}

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