Find the product mentally.
2 answers:
(ab+3)(ab−3)
=(ab+3)(ab+−3)
=(ab)(ab)+(ab)(−3)+(3)(ab)+(3)(−3)
=a^2b^2−3ab+3ab−9
=a^2b^2−9
Answer:
Option (c) is correct.

Step-by-step explanation:
Given : 
We have to find the product of 
Consider the given expression 
Apply algebraic identity, 
We have,
a = ab and b = 3

Simplify, we have,

Thus, 
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( I hope this was helpful ) >;D