16a^2-6a-5=0

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Solution for 16a^2-6a-5=0 equation:


Simplifying
16a2 + -6a + -5 = 0

Reorder the terms:
-5 + -6a + 16a2 = 0

Solving
-5 + -6a + 16a2 = 0

Solving for variable 'a'.

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

Divide each side by '16'.
-0.3125 + -0.375a + a2 = 0

Move the constant term to the right:

Add '0.3125' to each side of the equation.
-0.3125 + -0.375a + 0.3125 + a2 = 0 + 0.3125

Reorder the terms:
-0.3125 + 0.3125 + -0.375a + a2 = 0 + 0.3125

Combine like terms: -0.3125 + 0.3125 = 0.0000
0.0000 + -0.375a + a2 = 0 + 0.3125
-0.375a + a2 = 0 + 0.3125

Combine like terms: 0 + 0.3125 = 0.3125
-0.375a + a2 = 0.3125

The a term is -0.375a.  Take half its coefficient (-0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
-0.375a + 0.03515625 + a2 = 0.3125 + 0.03515625

Reorder the terms:
0.03515625 + -0.375a + a2 = 0.3125 + 0.03515625

Combine like terms: 0.3125 + 0.03515625 = 0.34765625
0.03515625 + -0.375a + a2 = 0.34765625

Factor a perfect square on the left side:
(a + -0.1875)(a + -0.1875) = 0.34765625

Calculate the square root of the right side: 0.589623821

Break this problem into two subproblems by setting 
(a + -0.1875) equal to 0.589623821 and -0.589623821.

Subproblem 1

a + -0.1875 = 0.589623821 Simplifying a + -0.1875 = 0.589623821 Reorder the terms: -0.1875 + a = 0.589623821 Solving -0.1875 + a = 0.589623821 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + a = 0.589623821 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + a = 0.589623821 + 0.1875 a = 0.589623821 + 0.1875 Combine like terms: 0.589623821 + 0.1875 = 0.777123821 a = 0.777123821 Simplifying a = 0.777123821

Subproblem 2

a + -0.1875 = -0.589623821 Simplifying a + -0.1875 = -0.589623821 Reorder the terms: -0.1875 + a = -0.589623821 Solving -0.1875 + a = -0.589623821 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + a = -0.589623821 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + a = -0.589623821 + 0.1875 a = -0.589623821 + 0.1875 Combine like terms: -0.589623821 + 0.1875 = -0.402123821 a = -0.402123821 Simplifying a = -0.402123821

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.777123821, -0.402123821}

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