a^2-6a-5=0

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


Simplifying
a2 + -6a + -5 = 0

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

Solving
-5 + -6a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -6a + 5 + a2 = 0 + 5

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

Combine like terms: -5 + 5 = 0
0 + -6a + a2 = 0 + 5
-6a + a2 = 0 + 5

Combine like terms: 0 + 5 = 5
-6a + a2 = 5

The a term is -6a.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6a + 9 + a2 = 5 + 9

Reorder the terms:
9 + -6a + a2 = 5 + 9

Combine like terms: 5 + 9 = 14
9 + -6a + a2 = 14

Factor a perfect square on the left side:
(a + -3)(a + -3) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(a + -3) equal to 3.741657387 and -3.741657387.

Subproblem 1

a + -3 = 3.741657387 Simplifying a + -3 = 3.741657387 Reorder the terms: -3 + a = 3.741657387 Solving -3 + a = 3.741657387 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + a = 3.741657387 + 3 Combine like terms: -3 + 3 = 0 0 + a = 3.741657387 + 3 a = 3.741657387 + 3 Combine like terms: 3.741657387 + 3 = 6.741657387 a = 6.741657387 Simplifying a = 6.741657387

Subproblem 2

a + -3 = -3.741657387 Simplifying a + -3 = -3.741657387 Reorder the terms: -3 + a = -3.741657387 Solving -3 + a = -3.741657387 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + a = -3.741657387 + 3 Combine like terms: -3 + 3 = 0 0 + a = -3.741657387 + 3 a = -3.741657387 + 3 Combine like terms: -3.741657387 + 3 = -0.741657387 a = -0.741657387 Simplifying a = -0.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. a = {6.741657387, -0.741657387}

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