The rationalising factor of ${a^{1/3}} + {a^{ - 1/3}}$ is
The rationalising factor of ${a^{1/3}} + {a^{ - 1/3}}$ is
- A
${a^{1/3}} - {a^{ - 1/3}}$
- B
${a^{2/3}} + {a^{ - 2/3}}$
- C
${a^{2/3}} - {a^{ - 2/3}}$
- D
${a^{2/3}} + {a^{ - 2/3}} - 1$
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Solution of the equation ${9^x} - {2^{x + {1 \over 2}}} = {2^{x + {3 \over 2}}} - {3^{2x - 1}}$
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