Question

show the steps of this expansions sum

(99)2​

Answer 1

hey mate....

99 can be written as

(100-1)^2

now put the formula

(a-b)^2

here

a=100 b=1

a^2-2ab +b^2

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

10000-200+1

9801


is ur answer

Answer 2

Answer:

$\bold{9801}$

Step-by-step explanation:

$99^2\\\\= (100-1)^2\\\\\text{Using, (a-b)^2 = a^2 + b^2 - 2(ab) ,}\\\\= (100)^2 + (1)^2 - 2(100)(1)\\\\= 10000 + 1 - 200\\\\= 10001 - 200\\\\= \bold{9801}$