a^2-5a-2=0

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


Simplifying
a2 + -5a + -2 = 0

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

Solving
-2 + -5a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -5a + 2 + a2 = 0 + 2

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

Combine like terms: -2 + 2 = 0
0 + -5a + a2 = 0 + 2
-5a + a2 = 0 + 2

Combine like terms: 0 + 2 = 2
-5a + a2 = 2

The a term is -5a.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5a + 6.25 + a2 = 2 + 6.25

Reorder the terms:
6.25 + -5a + a2 = 2 + 6.25

Combine like terms: 2 + 6.25 = 8.25
6.25 + -5a + a2 = 8.25

Factor a perfect square on the left side:
(a + -2.5)(a + -2.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(a + -2.5) equal to 2.872281323 and -2.872281323.


Subproblem 1
a + -2.5 = 2.872281323

Simplifying
a + -2.5 = 2.872281323

Reorder the terms:
-2.5 + a = 2.872281323

Solving
-2.5 + a = 2.872281323

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '2.5' to each side of the equation.
-2.5 + 2.5 + a = 2.872281323 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + a = 2.872281323 + 2.5
a = 2.872281323 + 2.5

Combine like terms: 2.872281323 + 2.5 = 5.372281323
a = 5.372281323

Simplifying
a = 5.372281323


Subproblem 2
a + -2.5 = -2.872281323

Simplifying
a + -2.5 = -2.872281323

Reorder the terms:
-2.5 + a = -2.872281323

Solving
-2.5 + a = -2.872281323

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '2.5' to each side of the equation.
-2.5 + 2.5 + a = -2.872281323 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + a = -2.872281323 + 2.5
a = -2.872281323 + 2.5

Combine like terms: -2.872281323 + 2.5 = -0.372281323
a = -0.372281323

Simplifying
a = -0.372281323


Solution
The solution to the problem is based on the solutions
from the subproblems.
a = {5.372281323, -0.372281323}

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