Question

Q.4 Evaluate the following using a suitable identity:
(a) 998^-4​

Answer 1

Answer:

$\frac{998}{4}$

Answer 2

Answer:

998^-4

= ((1000-2)^2)^-2 (a-b)^2 = a^2 + b^2 - 2ab

=(1000000 + 4 - 4000)^-2

=(996,004)^-2

=(1/(996004)^2)

= 1/ 992,023,968,016

I hope it helps you!!