Use direct method to evaluate the following product:

(5a + 16) (3a - 7)

(5a + 16) (3a - 7)

= (5a $\times$ 3a) + (5a $\times$ (- 7) + 3a $\times$ 16) + (16 $\times$ (- 7))

= 15a² + (-35a + 48a) - 112

= 15a² + 13a - 112

Hence, (5a + 16) (3a - 7) = 15a² + 13a - 112