Given,

p² + 6p – 16

Now first find the numbers whose-

Sum = 6 and

Product = - 16

Required numbers are 8 and 2,

So we get;

p² + 6p – 16

= p² + 8p – 2p – 16

= p(p + 8) – 2(p + 8)

= (p + 8)(p – 2)