2. Polynomials
hard

યોગ્ય નિત્યસમનો ઉપયોગ કરીને $(998)^{3}$ ની કિંમત મેળવો.

A

$894041942$

B

$894051922$

C

$9961196$

D

$994011992$

Solution

$(998)^{3}=(1000-2)^{3}$

$=(1000)^{3}-(2)^{3}-3(1000)(2)(1000-2)$

$=1000000000-8-6000(1000-2)$

$=1000000000-8-6000000+12000$

$=994011992$

Standard 9
Mathematics

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