Question

evaluate the following by using identity 291×309​

Answer 1

Answer:

(300-9)(300+9)

(a+b)(a-b) = a sq. - bsq.

90000 - 81

89919 ✓

hope it's help u....

Answer 2

Answer:

We can write 291 and 309 like this :-

(300 - 9) × ( 300+9)

This is in the form (a+b) × (a-b). The algebraic identity is (a+b) × (a-b) = a^2 - b^2

So we substitute values in the above identity.

300 ^ 2 - 9^2

90000 - 81

Answer :- 89919

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