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The product (x^2-1)(x^4+x^2+1) is equal ...

The product `(x^2-1)(x^4+x^2+1)` is equal to: (a)`x^8-1` (b) `x^8+1` (c) `x^6-1` (d) `x^6+1`

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`(x^2-1)(x^4+x^2+1)`
`=x^6+x^4+x^2-x^4-x^2-1`
`=x^6+1`.
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