(ab+2)(ab-2)=

Solution for (ab+2)(ab-2)= equation:

Simplifying
(ab + 2)(ab + -2) = 0

Reorder the terms:
(2 + ab)(ab + -2) = 0

Reorder the terms:
(2 + ab)(-2 + ab) = 0

Multiply (2 + ab) * (-2 + ab)
(2(-2 + ab) + ab(-2 + ab)) = 0
((-2 * 2 + ab * 2) + ab(-2 + ab)) = 0
((-4 + 2ab) + ab(-2 + ab)) = 0
(-4 + 2ab + (-2 * ab + ab * ab)) = 0
(-4 + 2ab + (-2ab + a2b2)) = 0

Combine like terms: 2ab + -2ab = 0
(-4 + 0 + a2b2) = 0
(-4 + a2b2) = 0

Solving
-4 + a2b2 = 0

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 + a2b2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + a2b2 = 0 + 4
a2b2 = 0 + 4

Combine like terms: 0 + 4 = 4
a2b2 = 4

Divide each side by 'b2'.
a2 = 4b-2

Simplifying
a2 = 4b-2

Take the square root of each side:
a = {-2b-1, 2b-1}