1.

Find the following products : (x + 7) (x - 2)

Answer»

Using the identity : (x + a) (x + b) = x2 + (a + b) x + ab, we have 

(x + 7) (x - 2) = (x + 7) (x + (-2)) 

 = x2 + 7x + (-2)x + 7 × (-2) 

 = x2 + 5x - 14



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