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$\left(x^{2}-1\right)\left(x^{4}+x^{2}+1\right)$

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$\left(x^{2}-1\right)\left(x^{4}+x^{2}+1\right)=\left(x^{2}-1\right)\left\{\left(x^{2}\right)^{2}+\left(x^{2}\right)(1)+(1)^{2}\right\}$

$=\left(x^{2}\right)^{3}-(1)^{3}$ $\quad\left[\because(a-b)\left(a^{2}+a b+b\right)^{2}=a^{3}-b^{3}\right]$

$=x^{6}-1$

Similar Questions

Classify the following as linear, quadratic or cubic polynomial

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If $x+1$ is a factor of the polynomial $2 x^{2}+k x,$ then the value of $k$ is