Question

fan) (1.02)2 – (0.987 (ii) 1532 – 1472 fix) 10.5 x 9.5 1. Using a? - b2 = (a + b)(a - b), find i 512 - 492 u 12.12 - 7.92 (a+h) x + ab, find​

Answer 1

Answer:

Correct option is

A

2.001  

Given, (1.02)  

2

+(0.98)  

2

.

We know, (a+b)  

2

=a  

2

+2ab+b  

2

.

Then,

(1.02)  

2

+(0.98)  

2

 

=(1.02)  

2

+(0.98)  

2

+(2×1.02×0.98)−(2×1.02×0.98)

=(1.02+0.98)  

2

−1.9992

=(2)  

2

−1.9992

=4−1.9992

=2.0008.

When corrected to three decimal digit,

2.0008 =2.001.

Therefore, option A is correct.