(p²+11p+28)/(p+4)

First let us simplify the numerator

taking p²+11p+28

p²+7p+4p+28

p(p+7)+4(p+7)

(p+4)(p+7)

So the numerator can be written as (p+7)(p+4)

putting this is the question

We have ((p+7)(p+4)) / (p+4)

(p+4) gets cancelled

So we are left with p+7

Hence on simplification our answer is p+7.