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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