Use direct method to evaluate the following product:

(8 - b) (3 + b)

(8 - b) (3 + b)

= (8 $\times$ 3) + (8 $\times$ b + (- b) $\times$ 3) + ((- b) $\times$ b)

= 24 + (8b - 3b) - b²

= 24 + 5b - b²

Hence, (8 - b) (3 + b) = 24 + 5b - b²