\(=\left(x^4+x\right)-30x^2+30x-30\)
\(=x\left(x^3+1\right)-30\left(x^2-x+1\right)\)
\(=x\left(x+1\right)\left(x^2-x+1\right)-30\left(x^2-x+1\right)\)
\(=\left(x^2-x+1\right)\left[x\left(x+1\right)-30\right]\)
\(=\left(x^2-x+1\right)\left(x^2+x-30\right)\)
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