Question

(b-3) (3b-7) - 3b (b-3) при b = 3,7 ( степень)

Answer 1

3b^2-7b+9b+21-3^2+9b=21-7b

21-7b при b=3,7=21-25,9=4,9

Answer 2

3b^2-7b-9b+21-3b^2+9b^2=-7b+21=7*(-b+21)=7*(-3.7+3)= -4,9