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Find the product mentally. (ab + 3)(ab - 3)
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1 vote
Find the product mentally. (ab + 3)(ab - 3)

User James Graham
by
7.1k points

2 Answers

0 votes
This is a difference if squares.

Multiply the terms in the parenthesis with the respective equal one.

I mean: ab*ab and +3*(-3)

a^2b^2 - 9
User Comendeiro
by
6.2k points
6 votes

Use the FOIL method

a^2b^2 - 9

User John Burley
by
7.2k points
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