a) 197 x 202 = 197 x (200+2) = 197 x 200 + 197 x 2 = 197 x 100 x 2 + 197 x 2 = 19700 x 2 + 197 x 2 = (19700 +197) x 2 = 19897 x 2 = 39794b) (1.05)sqrd - (0.95)sqrd = 1.1025 - 0.9025 (no suitable ways to do this other than bare calculating) = 0.2
Hello!
a)
= 39 794
b)
1.05 *1.05 - 0.95*0.95
= 1.1025 - 0.9025
= 0.2
