Question

by using identities find the value of 105×98 ​

Answer 1

Answer:

10290

Step-by-step explanation:

Identity used

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

(100+5) (100-2)

100(100-2)+5(100-2)

10000-200+500-10

10000+300-10

10000+290

10290

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Answer 2

Answer:

10290

Step-by-step explanation:

=(100+5)×(100-2)

=(100)²+{5+(-2)} 100+(-10)

=10000+300-10

=10000+290

=10290

using identity (x+a)(x+b)=x²+x(a+b)+ab.