Q3 of 53 Page 73

Factorise:

(0.7)2 – (0.3)2

: Using the identity,

x2–y2 = (x + y)(x–y)


so, 0.72–0.32 = (0.7–0.3)(0.7 + 0.3)


= 0.41.0


= 0.4


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In the following, you are given the product pq and the sum p + q. Determine p and q:

pq = 18 and p + q = 11