How do you factor $3 x^{5} - 21 x^{4} + 15 x^{3}$ $3x^5 - 21x^4 + 15x^3$ ?

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Answer 1 · 2015-05-16T15:28:52

f(x) = 3x^3(x^2 - 7x + 5)

The trinomial in parentheses can't be factored because its Determinant D = b^2 - 4ac = 29 isn't a perfect square.

How do you factor 3x^5 - 21x^4 + 15x^33x5−21x4+15x33x^5 - 21x^4 + 15x^3?