Question

use short cut to find (a) 11×11-10×10 , (b) 25×25-24×24,(c) 139×139-138×138

Answer 1

hey mate!!

here is your answer:

you can use the identity of a^2-b^2=(a-b)(a+b)

a)11×11-10×10=11^2-10^2=(11-10)(11+10)=1×21=21
b)25×15-24×24=25^2-24^2=(25-24)(25+24)=1×49=49
c)139×139-138×138=139^2-138^2=(139-138)(139+138)=1×277=277

hope it helped!

Answer 2

277 is the answers of questions