Question

use suitable identity to evalute 99^2​

Answer 1

Answer:

(100-1)^2

(a-b)^2=a^2-2ab+b^2

=100^2-2x100x1+1^2

=10000-200+1

=9801

Step-by-step explanation:

Answer 2

Step-by-step explanation:

(99)

2

=(100−1)

2

(100−1)

2

is of the form (a−b)

2

=a

2

+b

2

−2ab where a=100,b=1

∴(100−1)

2

=100

2

+1

2

−2×100×1

=10000+1−200=10000−199=9801