a^2-11a-8=0

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Solution for a^2-11a-8=0 equation:


Simplifying
a2 + -11a + -8 = 0

Reorder the terms:
-8 + -11a + a2 = 0

Solving
-8 + -11a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -11a + 8 + a2 = 0 + 8

Reorder the terms:
-8 + 8 + -11a + a2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -11a + a2 = 0 + 8
-11a + a2 = 0 + 8

Combine like terms: 0 + 8 = 8
-11a + a2 = 8

The a term is -11a.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11a + 30.25 + a2 = 8 + 30.25

Reorder the terms:
30.25 + -11a + a2 = 8 + 30.25

Combine like terms: 8 + 30.25 = 38.25
30.25 + -11a + a2 = 38.25

Factor a perfect square on the left side:
(a + -5.5)(a + -5.5) = 38.25

Calculate the square root of the right side: 6.184658438

Break this problem into two subproblems by setting 
(a + -5.5) equal to 6.184658438 and -6.184658438.

Subproblem 1

a + -5.5 = 6.184658438 Simplifying a + -5.5 = 6.184658438 Reorder the terms: -5.5 + a = 6.184658438 Solving -5.5 + a = 6.184658438 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + a = 6.184658438 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + a = 6.184658438 + 5.5 a = 6.184658438 + 5.5 Combine like terms: 6.184658438 + 5.5 = 11.684658438 a = 11.684658438 Simplifying a = 11.684658438

Subproblem 2

a + -5.5 = -6.184658438 Simplifying a + -5.5 = -6.184658438 Reorder the terms: -5.5 + a = -6.184658438 Solving -5.5 + a = -6.184658438 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + a = -6.184658438 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + a = -6.184658438 + 5.5 a = -6.184658438 + 5.5 Combine like terms: -6.184658438 + 5.5 = -0.684658438 a = -0.684658438 Simplifying a = -0.684658438

Solution

The solution to the problem is based on the solutions from the subproblems. a = {11.684658438, -0.684658438}

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