а) (b+3)*(b-3)+(2b+3) = b^2 - 3b + 3b - 9 + 2b + 3= b^2 + 2b - 6
б) (c+2)(c-3)-(c+1)(c+3) = c^2 - 3c + 2c - 6 - (c^2 + 3c + c + 3)= c^2 - c - 6 - c^2 - 4c - 3= -5c - 9
а) (b+3)*(b-3)+(2b+3) = b^2 - 3b + 3b - 9 + 2b + 3
= b^2 + 2b - 6
б) (c+2)(c-3)-(c+1)(c+3) = c^2 - 3c + 2c - 6 - (c^2 + 3c + c + 3)
= c^2 - c - 6 - c^2 - 4c - 3
= -5c - 9