1.

Factories st+pt+pq+sq.​

Answer»

(t+Q)(s+p)Step-by-step EXPLANATION:FACTORISE:  st+pt+pq+sq.st+pt+pq+sq = (st+pt) + (sq+pq)                      = t(s+p) + q(s+p)                      = (t+q)(s+p)



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