Factorise: a) p²+pq+4p-4q
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Answer:
the question should be p²-pq+4p-4q
Step-by-step explanation:
p²-pq+4p-4q
=p(p-q)+4(p-q)
=(p-q) (p+4)
》p-q=0 /p+4=0
》p=q /p= -4
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