8 PRACTICAL MATHEMATICS 



Expand ( 2x - ) . Here n = 7. 

 \ * X J 



B = A x =7x3= 21 



D = C x - =35 



4 



E=Dx|=35xf=21 

 5 5 



F=Ex|=21 x 1=7 

 o o 



G-Fx i- 7x1-1 



Then ( 2 ,-i)'={ 2 * + (_i-)} 7 



(_V 



V 2x/ 





Expand (1 2) ~ 3 to 5 terms. Here w = - 3. 

 A, =^ -3 



B = A x - =-3 x-2=6 



m 



C = B x ^- = 6 x - - 10 



D = C x ~ = - 10 x - 5 = 15 



4 2 



