Question 72 (f)
Find the value of (80−20)×(80+20)
(80−20)×(80+20)=(1−1)×(1+1)=0×2=0
Find the value of:
(i) √80√405 (ii) √441√625 (iii) √1587√1728 (iv) √72×√338 (v) √45×√20
Question 72 (d)
Find the value of (20+30+40)(40−30−20)