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If a >0, then least value of (a^3+a^2+a+...

If `a >0,` then least value of `(a^3+a^2+a+1)^2` is (a)`64 a^2` (b)`16 a^4` (c)`16 a^3` (d)d. none of these

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CENGAGE ENGLISH-SEQUENCES AND SERIES-All Questions
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  3. If a >0, then least value of (a^3+a^2+a+1)^2 is (a)64 a^2 (b)16 a^4 ...

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