11a^2-a-7=0

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Solution for 11a^2-a-7=0 equation:


Simplifying
11a2 + -1a + -7 = 0

Reorder the terms:
-7 + -1a + 11a2 = 0

Solving
-7 + -1a + 11a2 = 0

Solving for variable 'a'.

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

Divide each side by '11'.
-0.6363636364 + -0.09090909091a + a2 = 0

Move the constant term to the right:

Add '0.6363636364' to each side of the equation.
-0.6363636364 + -0.09090909091a + 0.6363636364 + a2 = 0 + 0.6363636364

Reorder the terms:
-0.6363636364 + 0.6363636364 + -0.09090909091a + a2 = 0 + 0.6363636364

Combine like terms: -0.6363636364 + 0.6363636364 = 0.0000000000
0.0000000000 + -0.09090909091a + a2 = 0 + 0.6363636364
-0.09090909091a + a2 = 0 + 0.6363636364

Combine like terms: 0 + 0.6363636364 = 0.6363636364
-0.09090909091a + a2 = 0.6363636364

The a term is -0.09090909091a.  Take half its coefficient (-0.04545454546).
Square it (0.002066115703) and add it to both sides.

Add '0.002066115703' to each side of the equation.
-0.09090909091a + 0.002066115703 + a2 = 0.6363636364 + 0.002066115703

Reorder the terms:
0.002066115703 + -0.09090909091a + a2 = 0.6363636364 + 0.002066115703

Combine like terms: 0.6363636364 + 0.002066115703 = 0.638429752103
0.002066115703 + -0.09090909091a + a2 = 0.638429752103

Factor a perfect square on the left side:
(a + -0.04545454546)(a + -0.04545454546) = 0.638429752103

Calculate the square root of the right side: 0.799017992

Break this problem into two subproblems by setting 
(a + -0.04545454546) equal to 0.799017992 and -0.799017992.

Subproblem 1

a + -0.04545454546 = 0.799017992 Simplifying a + -0.04545454546 = 0.799017992 Reorder the terms: -0.04545454546 + a = 0.799017992 Solving -0.04545454546 + a = 0.799017992 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.04545454546' to each side of the equation. -0.04545454546 + 0.04545454546 + a = 0.799017992 + 0.04545454546 Combine like terms: -0.04545454546 + 0.04545454546 = 0.00000000000 0.00000000000 + a = 0.799017992 + 0.04545454546 a = 0.799017992 + 0.04545454546 Combine like terms: 0.799017992 + 0.04545454546 = 0.84447253746 a = 0.84447253746 Simplifying a = 0.84447253746

Subproblem 2

a + -0.04545454546 = -0.799017992 Simplifying a + -0.04545454546 = -0.799017992 Reorder the terms: -0.04545454546 + a = -0.799017992 Solving -0.04545454546 + a = -0.799017992 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.04545454546' to each side of the equation. -0.04545454546 + 0.04545454546 + a = -0.799017992 + 0.04545454546 Combine like terms: -0.04545454546 + 0.04545454546 = 0.00000000000 0.00000000000 + a = -0.799017992 + 0.04545454546 a = -0.799017992 + 0.04545454546 Combine like terms: -0.799017992 + 0.04545454546 = -0.75356344654 a = -0.75356344654 Simplifying a = -0.75356344654

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.84447253746, -0.75356344654}

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