Question

Please solve these two sums as soon as possible..

Answer 1

25.

x^2+1/x^2=27

x^2+1/x^2-2=27-2

=x^2+1/x^2-1*x*1/x=25

=(x-1/x)^2=5^2

x-1/x=+5 or -5.

26.

(998)^2-2^2

=(998+2)(998-2)

=1000*996

=996000

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Answer 2

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