Question

Упростите выражение
5b(b-c)+c(2b-c)

Answer 1

5b(b-c)+c(2b-c)=5b²-5bc+2bc-c²=5b²-3bc-c²

Answer 2

5b(b-c)+c(2b-c)=5b²-5bc+2bc-c²=5b²-3bc-c²= -2bc +2bc =0