Question 1048157
(3a-2b)^2
solu: its like (a-b)^2
          as (a-b)^2 = a^2-2ab+b^2
          now, a=3a and b=2b
             =(3a)^2-2(3a)(2b)+(2b)^2
             =9a^2-(6a)(4b)+4b^2
             =therefore , in thius method is 9a^2-24ab+4b^2