Question

evlaute using identites (i) 103 × 98 (ii) 7.5 × 7.3​

Answer 1

Answer:

frist

(100+3) (100-3)

=100square -3square

( by a2-b2 using identity)

=10000-9 =9991

second I don't know

Answer 2

$(1.) \: 103 \times 98 \\ = (100 + 3)(100 - 2) \\ = 100(100 - 2) + 3(100 - 2) \\ = 10000 - 200 + 300 - 6 \\ = 10094$

First answer=10094

$(2.)7.5 \times 7.3 \\ = (10 - 2.5)(10 - 2.7) \\ = 10(10 - 2.7) - 2.5(10 - 2.7) \\ = 100 - 27 - 25 + 6.75 \\ = 54.75$

Second answer=54.75