How do you factor $7x^3 - 21x^2 - 2x + 6$ by grouping?

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Answer 1 · 2016-05-31T23:56:05

$(x - 3)(sqrt7x - sqrt2)(sqrt7x + sqrt2)$

$f(x) = 7x^2(x - 3) - 2(x - 3)$
$f(x) = (x - 3)(7x^2 - 2)$
$f(x) = (x - 3)(sqrt7x - sqrt2)(sqrt7x + sqrt2)$

How do you factor 7x^3 - 21x^2 - 2x + 67x^3 - 21x^2 - 2x + 6 by grouping?