Question
Download Solution PDFకింది వాటిలో సరైనది ఏది?
I. \(\mathrm{K}+\frac{1}{\mathrm{~K}}=12\) అయితే, అప్పుడు \(\mathrm{K}^2+\frac{1}{\mathrm{~K}^2}=142\)
II. \(\left(\mathrm{k}^2+\frac{1}{\mathrm{k}^2}\right)\left(\mathrm{k}-\frac{1}{\mathrm{k}}\right)\left(\mathrm{k}^4+\frac{1}{\mathrm{k}^4}\right)\left(\mathrm{k}+\frac{1}{\mathrm{k}}\right) \) యొక్క విలువ
\(\mathrm{k}^{16}-\frac{1}{\mathrm{k}^{16}}\)
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFఇచ్చినది:
k + 1/k = 12
ఉపయోగించిన సూత్రం:
(x + 1/x)2 = (x2 + 1/x2) + 2
(a - b)(a + b) = a2 - b2
గణన:
మొదటి ప్రకటన తీసుకోండి
k + 1/k = 12
ఉపయోగించండి
(x + 1/x)2 = (x2 + 1/x2) + 2
(k2 + 1/k2) = 144 - 2
(k2 + 1/k2) = =142
కాబట్టి, మొదటి ప్రకటన నిజం.
రెండో ప్రకటన తీసుకోండి
\(\left(\mathrm{k}^2+\frac{1}{\mathrm{k}^2}\right)\left(\mathrm{k}-\frac{1}{\mathrm{k}}\right)\left(\mathrm{k}^4+\frac{1}{\mathrm{k}^4}\right)\left(\mathrm{k}+\frac{1}{\mathrm{k}}\right) \)
ఉపయోగించండి (a - b)(a + b) = a2 - b2
\(\left(\mathrm{k}^2+\frac{1}{\mathrm{k}^2}\right)\left(\mathrm{k^2}-\frac{1}{\mathrm{k^2}}\right)\left(\mathrm{k}^4+\frac{1}{\mathrm{k}^4}\right)\)
\(\left(\mathrm{k^4}-\frac{1}{\mathrm{k^4}}\right)\left(\mathrm{k}^4+\frac{1}{\mathrm{k}^4}\right) \)
\(\mathrm{k}^{8}-\frac{1}{\mathrm{k}^{8}}\)
కాబట్టి, రెండవ ప్రకటన నిజం కాదు.
అందువల్ల, ప్రకటన I మాత్రమే నిజం.
∴ ఎంపిక 1 సరైన సమాధానం.
Mistake Points
ఇది గమనించండి,
(K4)2 = K4 * 2 = K8
కాబట్టి, ప్రకటన రెండు సరైనది కాదు.
Last updated on Jul 16, 2025
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