Упростить:(b+c)*(b-c)-b(b*2c)

Question

Упростить:(b+c)*(b-c)-b(b*2c)

Answer 1

 b^{2} -c ^{2} -( b^{2} -2cb)= b^{2} - c^{2} - b^{2} +2cb=2cb- c^{2} =c(2b-c)