Question

what is (2-1)(2+1) pls

Answer 1

Answer:

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$3$

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Answer 2

Answer:

2(2+1)-1(2+1)

=4+2-2-1

=6-2-1

=4-1

=3

Therefore,the answer will be = 3

OR

As we know the formula (a+b)(a-b) = (a) ^2-(b) ^2

So, (2)^2 - (1)^2

= 4-1

= 3