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b. (4a-5b)(2a+3b)
P+Q= 2
P × Q = 1
jadi p= 1 , Q=1
p²+pq+pq+q²
(p²+pq) + (pq+q²)
p(p+q) + q(p+q)
= (p+q) (p+q) ini faktornya