Q3 of 157 Page 22

Using the identity (x + a)(x + b) = x2 + (a + b)x + ab, find out the following products:

(x + 4)(x + 7)

Given (x + 4)(x + 7)


Using (x + a)(x + b) = x2 + (a + b)x + ab


(x + 4)(x + 7) = x2 + (4 + 7)x + 4× 7


⇒ (x + 4)(x + 7) = x2 + 11x + 28


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