Question

p square minus p minus 420

Answer 1

p^2 - p - 420

= p^2 - 21 p + 20p - 420

= p ( p - 21 ) + 20 ( p + 20 )

= ( p - 21 ) ( p + 20)

Answer 2

ur question is incomplete
p²-p-420=0
..
p²-21p+20p-420=0
..
p(p-21)+20(p-21)=0
..
(p-21)(p+20)=0
..
p=21,p=-20
..
therefore p cannot be negative
so p=21
..
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