Question

Using identities, find the value of the following:
i) 9.8 * 9.6
(ii)
153 square-147square​

Answer 1

Answer:

1. (9.7+0.1)(9.7-0.1) = 9.7 ^2 - 0.1 ^2 = 9.7997

2. (153+147)(153-147)=300 * 6=1800.

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Answer 2

Step-by-step explanation:

(i)using identity (x+a)(x+b)=x^2+(a+b)x+ab

(9+0.8)(9+0.6)=9^2+(0.8+0.6)9+0.8*0.6

=81+0.48*9+0.48

=85.8

(ii)(153)^2-(147)^2

a^2-b^2=(a+b)(a-b)

=(153+147)(153-147)

=300*6

=1800