Q3 of 157 Page 22

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

(8x – 5) (8x – 2)

Given (8x – 5) (8x – 2)


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


(8x – 5) (8x – 2) = (8x)2 + ( – 5 – 2)8x + ( – 5)×( – 2)


⇒ (8x – 5) (8x – 2) = 64x2 – 56x + 10


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