Question

evaluate using identities 63×59

Answer 1

(60+3)× (60-1)= (a+b)(a-c)=3717

Answer 2

Answer:

we will use the identity (x+a)(x+b)=x²+(a+b)x+ab

∴63×59=(60+3)(60-1)

=60²+(3-1)60+(-1)×3

=3600+120-3

=3717