Question

(x+1)(y+1)=xy+x+y+1
find 21×31using the above pprinciple

if you help me with the right answer i will mark u as the Brainliest Answer

Answer 1

Answer:

651

Step-by-step explanation:

FIRSTLY BREAK 21 AND 31

( 20 + 1 ) (30 + 1 )

x = 20 , y = 30

(20 ) (30) + ( 20 ) + ( 30 ) + 1

600 +20 + 30 +1

600 +50 +1

= 651