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Let a is a real number satisfying a^3+1/...

Let `a` is a real number satisfying `a^3+1/(a^3)=18` . Then the value of `a^4+1/(a^4)-39` is ____.

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CENGAGE ENGLISH-COMPLEX NUMBERS AND QUADRATIC EQUATIONS-All Questions
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  3. Let a is a real number satisfying a^3+1/(a^3)=18 . Then the value of a...

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  20. The polynomial f(x)=x^4+a x^3+b x^3+c x+d has real coefficients and f(...

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