10a^2-5a-2=0

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Solution for 10a^2-5a-2=0 equation:


Simplifying
10a2 + -5a + -2 = 0

Reorder the terms:
-2 + -5a + 10a2 = 0

Solving
-2 + -5a + 10a2 = 0

Solving for variable 'a'.

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

Divide each side by '10'.
-0.2 + -0.5a + a2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -0.5a + 0.2 + a2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -0.5a + a2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -0.5a + a2 = 0 + 0.2
-0.5a + a2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-0.5a + a2 = 0.2

The a term is -0.5a.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5a + 0.0625 + a2 = 0.2 + 0.0625

Reorder the terms:
0.0625 + -0.5a + a2 = 0.2 + 0.0625

Combine like terms: 0.2 + 0.0625 = 0.2625
0.0625 + -0.5a + a2 = 0.2625

Factor a perfect square on the left side:
(a + -0.25)(a + -0.25) = 0.2625

Calculate the square root of the right side: 0.512347538

Break this problem into two subproblems by setting 
(a + -0.25) equal to 0.512347538 and -0.512347538.

Subproblem 1

a + -0.25 = 0.512347538 Simplifying a + -0.25 = 0.512347538 Reorder the terms: -0.25 + a = 0.512347538 Solving -0.25 + a = 0.512347538 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + a = 0.512347538 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + a = 0.512347538 + 0.25 a = 0.512347538 + 0.25 Combine like terms: 0.512347538 + 0.25 = 0.762347538 a = 0.762347538 Simplifying a = 0.762347538

Subproblem 2

a + -0.25 = -0.512347538 Simplifying a + -0.25 = -0.512347538 Reorder the terms: -0.25 + a = -0.512347538 Solving -0.25 + a = -0.512347538 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + a = -0.512347538 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + a = -0.512347538 + 0.25 a = -0.512347538 + 0.25 Combine like terms: -0.512347538 + 0.25 = -0.262347538 a = -0.262347538 Simplifying a = -0.262347538

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.762347538, -0.262347538}

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