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2. Polynomials
medium
યોગ્ય નિત્યસમનો ઉપયોગ કરી, નીચેનાની કિંમત મેળવો.
$101 \times 102$
A
$10302$
B
$10002$
C
$10702$
D
$5002$
Solution
$101 \times 102=(100+1)(100+2)$
Now, using identify $(x+a)(x+b)=x^{2}+(a+b) x+a b,$ we have
$(100+1)(100+2)=(100)^{2}+(1+2) 100+(1)(2)$
$=10000+(3) 100+2=10000+300+2$
$=10302$
Standard 9
Mathematics