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7.Binomial Theorem
medium
જો ${({\alpha ^2}{x^2} - 2\alpha {\rm{ }}x + 1)^{51}}$ ના સહગુણકનો સરવાળો શૂન્ય હોય તો $\alpha $ મેળવો.
A
$2$
B
$-1$
C
$1$
D
$-2$
(IIT-1991)
Solution
(c) The sum of the coefficients of the polynomial ${({\alpha ^2}{x^2} – 2\alpha \,x + 1)^{51}}$ is obtained by putting $x = 1$ in ${({\alpha ^2}{x^2} – 2\alpha \,x + 1)^{51}}$.
Therefore by hypothesis ${({\alpha ^2} – 2\alpha + 1)^{51}} = 0 \Rightarrow \alpha = 1$
Standard 11
Mathematics