Question

2
)
7. Using a – b2 = (a + b)(a - b), find
(i) 512 - 492 (i) (1.02)2 – (0.98)
and
12 12
702​

Answer 1

(i) 51^2 - 49^2
> (51-49) (51+49)
> (2) (100)
> 200

(ii) 1.02^2 - 0.98^2
>. (1.02-.98) (1.02+.98)
>. (0.04) (2)
>. (0.08)