Question

Найди значение выражения: (7c−11d)⋅(7c+11d)−49c2,
если c=2 и d=0,01.

Answer 1

(7c-11d)(7c+11d)-49c²

1) (7c-11d)(7c+11d)=49c²-121d²

2) 49c²-121d²-49c²=-121d²=-0.0121