Question

answer the question in given photo:-​

Answer 1

Answer:

(21^2-19^2). {a^2-b^2=(a-b)(a+b) here, a=21 and b=19}

(21-19)(21+19)

(2)(40)

80

Answer 2

21sq.-19sq.

Step-by-step explanation:

using identity (a-b)sq. = (a-b)(a+b)

=(21- 19)(21+19)

=(2)(40)

=80

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