1.

Use suitable identities to find the products of (x + 5) (x + 2)

Answer»

(x + 5) (x + 2) 

= x2 + (5 + 2)x + 5 x 2 

[ ∵ (x + a) (x + b) = x2 + (a + b) x + ab] 

= x2 + 7x + 10



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