Упростите 6b^3-(3b^2+1)(2b-1)

Question

Упростите 6b^3-(3b^2+1)(2b-1)

Answer 1

6b^3 - (3b^2 + 1)(2b- 1) =
= 6b^3 - (6b^3 + 2b - 3b^2 - 1) =
= 6b^3 - 6b^3 - 2b + 3b^2+1=
= 3b^2 - 2b + 1