a^2+8a-11=6

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Solution for a^2+8a-11=6 equation:


Simplifying
a2 + 8a + -11 = 6

Reorder the terms:
-11 + 8a + a2 = 6

Solving
-11 + 8a + a2 = 6

Solving for variable 'a'.

Reorder the terms:
-11 + -6 + 8a + a2 = 6 + -6

Combine like terms: -11 + -6 = -17
-17 + 8a + a2 = 6 + -6

Combine like terms: 6 + -6 = 0
-17 + 8a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '17' to each side of the equation.
-17 + 8a + 17 + a2 = 0 + 17

Reorder the terms:
-17 + 17 + 8a + a2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + 8a + a2 = 0 + 17
8a + a2 = 0 + 17

Combine like terms: 0 + 17 = 17
8a + a2 = 17

The a term is 8a.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8a + 16 + a2 = 17 + 16

Reorder the terms:
16 + 8a + a2 = 17 + 16

Combine like terms: 17 + 16 = 33
16 + 8a + a2 = 33

Factor a perfect square on the left side:
(a + 4)(a + 4) = 33

Calculate the square root of the right side: 5.744562647

Break this problem into two subproblems by setting 
(a + 4) equal to 5.744562647 and -5.744562647.

Subproblem 1

a + 4 = 5.744562647 Simplifying a + 4 = 5.744562647 Reorder the terms: 4 + a = 5.744562647 Solving 4 + a = 5.744562647 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + a = 5.744562647 + -4 Combine like terms: 4 + -4 = 0 0 + a = 5.744562647 + -4 a = 5.744562647 + -4 Combine like terms: 5.744562647 + -4 = 1.744562647 a = 1.744562647 Simplifying a = 1.744562647

Subproblem 2

a + 4 = -5.744562647 Simplifying a + 4 = -5.744562647 Reorder the terms: 4 + a = -5.744562647 Solving 4 + a = -5.744562647 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + a = -5.744562647 + -4 Combine like terms: 4 + -4 = 0 0 + a = -5.744562647 + -4 a = -5.744562647 + -4 Combine like terms: -5.744562647 + -4 = -9.744562647 a = -9.744562647 Simplifying a = -9.744562647

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.744562647, -9.744562647}

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