11A-13=-7A^2

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Solution for 11A-13=-7A^2 equation:


Simplifying
11A + -13 = -7A2

Reorder the terms:
-13 + 11A = -7A2

Solving
-13 + 11A = -7A2

Solving for variable 'A'.

Combine like terms: -7A2 + 7A2 = 0
-13 + 11A + 7A2 = 0

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

Divide each side by '7'.
-1.857142857 + 1.571428571A + A2 = 0

Move the constant term to the right:

Add '1.857142857' to each side of the equation.
-1.857142857 + 1.571428571A + 1.857142857 + A2 = 0 + 1.857142857

Reorder the terms:
-1.857142857 + 1.857142857 + 1.571428571A + A2 = 0 + 1.857142857

Combine like terms: -1.857142857 + 1.857142857 = 0.000000000
0.000000000 + 1.571428571A + A2 = 0 + 1.857142857
1.571428571A + A2 = 0 + 1.857142857

Combine like terms: 0 + 1.857142857 = 1.857142857
1.571428571A + A2 = 1.857142857

The A term is 1.571428571A.  Take half its coefficient (0.7857142855).
Square it (0.6173469384) and add it to both sides.

Add '0.6173469384' to each side of the equation.
1.571428571A + 0.6173469384 + A2 = 1.857142857 + 0.6173469384

Reorder the terms:
0.6173469384 + 1.571428571A + A2 = 1.857142857 + 0.6173469384

Combine like terms: 1.857142857 + 0.6173469384 = 2.4744897954
0.6173469384 + 1.571428571A + A2 = 2.4744897954

Factor a perfect square on the left side:
(A + 0.7857142855)(A + 0.7857142855) = 2.4744897954

Calculate the square root of the right side: 1.57305111

Break this problem into two subproblems by setting 
(A + 0.7857142855) equal to 1.57305111 and -1.57305111.

Subproblem 1

A + 0.7857142855 = 1.57305111 Simplifying A + 0.7857142855 = 1.57305111 Reorder the terms: 0.7857142855 + A = 1.57305111 Solving 0.7857142855 + A = 1.57305111 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '-0.7857142855' to each side of the equation. 0.7857142855 + -0.7857142855 + A = 1.57305111 + -0.7857142855 Combine like terms: 0.7857142855 + -0.7857142855 = 0.0000000000 0.0000000000 + A = 1.57305111 + -0.7857142855 A = 1.57305111 + -0.7857142855 Combine like terms: 1.57305111 + -0.7857142855 = 0.7873368245 A = 0.7873368245 Simplifying A = 0.7873368245

Subproblem 2

A + 0.7857142855 = -1.57305111 Simplifying A + 0.7857142855 = -1.57305111 Reorder the terms: 0.7857142855 + A = -1.57305111 Solving 0.7857142855 + A = -1.57305111 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '-0.7857142855' to each side of the equation. 0.7857142855 + -0.7857142855 + A = -1.57305111 + -0.7857142855 Combine like terms: 0.7857142855 + -0.7857142855 = 0.0000000000 0.0000000000 + A = -1.57305111 + -0.7857142855 A = -1.57305111 + -0.7857142855 Combine like terms: -1.57305111 + -0.7857142855 = -2.3587653955 A = -2.3587653955 Simplifying A = -2.3587653955

Solution

The solution to the problem is based on the solutions from the subproblems. A = {0.7873368245, -2.3587653955}

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