Work Step by Step
Factor out the GCF $x$ to get $\\=x(x^2-4x-21)$. Factor the trinomial to get $\\=x(x-7)(x+3)$. Check by multiplying the factors: $=x(x^2+3x-7x-21) \\=x(x^2-4x-21) \\=x^3-4x^2-21x$.
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