Question

If we known the product of two number, how can we find that the product of two number obtained by adding a fixed number to each
we known
20×30=600
then 21×31=(20+1)(30+1)=20×30+(20+30)×1+1=651
22×32=(20+2)(30+2)=20×30+(20+30)×2+2skoyar =600+100+4=704
23×33=20+30+(20+30)3+3skoyar =--------
24×34=----
in general
(x+a)(y+a)=xy+----+----​

Answer 1

Answer:

If we known the product of two number, how can we find that the product of two number obtained by adding a fixed number to each we known. 20×30=600. then 21×31=(20+1)(30+1)=20×30+(20+30)×1+1=651. 22×32=(20+2)(30+2)=20×30+(20+30)×2+2skoyar =600+100+4=704.