Question

Use suitable identity to evaluate 99²

Answer 1

Step-by-step explanation:

99^2=(100-1)^2

=100^2-2(100)(1)+1

=10000-200+1

=9801

Answer 2

Answer:

Ans.

9801

Step-by-step explanation:

(99)² =(100−1)²

(100−1)² is of the form (a−b)²

=a²+b²−2ab,

where,

a=100,b=1

∴(100−1)²

=100² +1 ²−2×100×1

=10000+1−200

=10000−199

=9801

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