Using suitable identity find the value of the following:-
(A)86^2
(B)79 x 84
Answers!
B:-79*84
Sol.(80-1)*(80 4) -using identity (Iv)(x a)(x b)=x*x (a b)x ab
80*80 (-1 4)80 (-1*4)
6400 (3)*80 (-4)
6400 240-4
6640-4=6636
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Answer the question...
B:-79*84
Sol.(80-1)*(80 4) -using identity (Iv)(x a)(x b)=x*x (a b)x ab
80*80 (-1 4)80 (-1*4)
6400 (3)*80 (-4)
6400 240-4
6640-4=6636
Sol.(80-1)*(80 4) -using identity (Iv)(x a)(x b)=x*x (a b)x ab
80*80 (-1 4)80 (-1*4)
6400 (3)*80 (-4)
6400 240-4
6640-4=6636
Comment