Question

3.
Using suitable identities evaluate the following:
(a)
287 x 313
(d) 792
(9)
13.12 - 2.92
(b)
23 x 25
(e)
7.5 x 8.5
(h) 205 x 250
(c) 592 - 412
(f)
1092
(i) 1252​

Answer 1

Answer:

Correct option is

C

89991

(297)(303)

=(300−3)(300+3)

Using ,

(a−b)(a+b)=a2−b2 we get,

(300)2−(3)2

=90000−9

=89991