Question

2
p - 16p + 64

Answer 1

if you want to factor, find two numbers that multiply to 64 and add to -16 at the same time

Answer 2

p^2 + 16p + 64
you want 2 numbers whose product is 64 and whose sum is 16. 8 times 8 is 64. 8 plus 8 is 16
p^2 + 16p + 64=(p+8)(p+8)=(p+8)^2