(A-2)(A+1)=3A^2-4

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Solution for (A-2)(A+1)=3A^2-4 equation:


Simplifying
(A + -2)(A + 1) = 3A2 + -4

Reorder the terms:
(-2 + A)(A + 1) = 3A2 + -4

Reorder the terms:
(-2 + A)(1 + A) = 3A2 + -4

Multiply (-2 + A) * (1 + A)
(-2(1 + A) + A(1 + A)) = 3A2 + -4
((1 * -2 + A * -2) + A(1 + A)) = 3A2 + -4
((-2 + -2A) + A(1 + A)) = 3A2 + -4
(-2 + -2A + (1 * A + A * A)) = 3A2 + -4
(-2 + -2A + (1A + A2)) = 3A2 + -4

Combine like terms: -2A + 1A = -1A
(-2 + -1A + A2) = 3A2 + -4

Reorder the terms:
-2 + -1A + A2 = -4 + 3A2

Solving
-2 + -1A + A2 = -4 + 3A2

Solving for variable 'A'.

Reorder the terms:
-2 + 4 + -1A + A2 + -3A2 = -4 + 3A2 + 4 + -3A2

Combine like terms: -2 + 4 = 2
2 + -1A + A2 + -3A2 = -4 + 3A2 + 4 + -3A2

Combine like terms: A2 + -3A2 = -2A2
2 + -1A + -2A2 = -4 + 3A2 + 4 + -3A2

Reorder the terms:
2 + -1A + -2A2 = -4 + 4 + 3A2 + -3A2

Combine like terms: -4 + 4 = 0
2 + -1A + -2A2 = 0 + 3A2 + -3A2
2 + -1A + -2A2 = 3A2 + -3A2

Combine like terms: 3A2 + -3A2 = 0
2 + -1A + -2A2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-1 + 0.5A + A2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 0.5A + 1 + A2 = 0 + 1

Reorder the terms:
-1 + 1 + 0.5A + A2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 0.5A + A2 = 0 + 1
0.5A + A2 = 0 + 1

Combine like terms: 0 + 1 = 1
0.5A + A2 = 1

The A term is 0.5A.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5A + 0.0625 + A2 = 1 + 0.0625

Reorder the terms:
0.0625 + 0.5A + A2 = 1 + 0.0625

Combine like terms: 1 + 0.0625 = 1.0625
0.0625 + 0.5A + A2 = 1.0625

Factor a perfect square on the left side:
(A + 0.25)(A + 0.25) = 1.0625

Calculate the square root of the right side: 1.030776406

Break this problem into two subproblems by setting 
(A + 0.25) equal to 1.030776406 and -1.030776406.

Subproblem 1

A + 0.25 = 1.030776406 Simplifying A + 0.25 = 1.030776406 Reorder the terms: 0.25 + A = 1.030776406 Solving 0.25 + A = 1.030776406 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + A = 1.030776406 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + A = 1.030776406 + -0.25 A = 1.030776406 + -0.25 Combine like terms: 1.030776406 + -0.25 = 0.780776406 A = 0.780776406 Simplifying A = 0.780776406

Subproblem 2

A + 0.25 = -1.030776406 Simplifying A + 0.25 = -1.030776406 Reorder the terms: 0.25 + A = -1.030776406 Solving 0.25 + A = -1.030776406 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + A = -1.030776406 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + A = -1.030776406 + -0.25 A = -1.030776406 + -0.25 Combine like terms: -1.030776406 + -0.25 = -1.280776406 A = -1.280776406 Simplifying A = -1.280776406

Solution

The solution to the problem is based on the solutions from the subproblems. A = {0.780776406, -1.280776406}

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