A^2+12A=54

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Solution for A^2+12A=54 equation:


Simplifying
A2 + 12A = 54

Reorder the terms:
12A + A2 = 54

Solving
12A + A2 = 54

Solving for variable 'A'.

Reorder the terms:
-54 + 12A + A2 = 54 + -54

Combine like terms: 54 + -54 = 0
-54 + 12A + A2 = 0

Begin completing the square.

Move the constant term to the right:

Add '54' to each side of the equation.
-54 + 12A + 54 + A2 = 0 + 54

Reorder the terms:
-54 + 54 + 12A + A2 = 0 + 54

Combine like terms: -54 + 54 = 0
0 + 12A + A2 = 0 + 54
12A + A2 = 0 + 54

Combine like terms: 0 + 54 = 54
12A + A2 = 54

The A term is 12A.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12A + 36 + A2 = 54 + 36

Reorder the terms:
36 + 12A + A2 = 54 + 36

Combine like terms: 54 + 36 = 90
36 + 12A + A2 = 90

Factor a perfect square on the left side:
(A + 6)(A + 6) = 90

Calculate the square root of the right side: 9.486832981

Break this problem into two subproblems by setting 
(A + 6) equal to 9.486832981 and -9.486832981.

Subproblem 1

A + 6 = 9.486832981 Simplifying A + 6 = 9.486832981 Reorder the terms: 6 + A = 9.486832981 Solving 6 + A = 9.486832981 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + A = 9.486832981 + -6 Combine like terms: 6 + -6 = 0 0 + A = 9.486832981 + -6 A = 9.486832981 + -6 Combine like terms: 9.486832981 + -6 = 3.486832981 A = 3.486832981 Simplifying A = 3.486832981

Subproblem 2

A + 6 = -9.486832981 Simplifying A + 6 = -9.486832981 Reorder the terms: 6 + A = -9.486832981 Solving 6 + A = -9.486832981 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + A = -9.486832981 + -6 Combine like terms: 6 + -6 = 0 0 + A = -9.486832981 + -6 A = -9.486832981 + -6 Combine like terms: -9.486832981 + -6 = -15.486832981 A = -15.486832981 Simplifying A = -15.486832981

Solution

The solution to the problem is based on the solutions from the subproblems. A = {3.486832981, -15.486832981}

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