Question

(-21) (-30)
find product of the following
(-21)×(-30)​

Answer 1

Step-by-step explanation:

(-21)×(-30)=

(-20-1)×(-30)

-30(-20-1)

600+30

630 is the answer

Answer 2

Step-by-step explanation:

(-21)×(-30)

-1(30-9)×-1(30)

minus one and minus one get cancelled

(30-9)×30

=> (30)^2-9

900-9

891 is the answer (not sure)

(hope it helps)