How do you factor by grouping $3 x^{3} + 15 x^{2} - 4 x - 20$ $3x^3 + 15x^2 - 4x - 20$ ?

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How do you factor by grouping $3 x^{3} + 15 x^{2} - 4 x - 20$ $3x^3 + 15x^2 - 4x - 20$ ?

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Answer 1 · 2015-05-03T12:26:25

Collect $x$ $x$ betwen the first and third term and $5$ $5$ between the second and fourth:
$x (3 x^{2} - 4) + 5 (3 x^{2} - 4) =$ $x(3x^2-4)+5(3x^2-4)=$

collect #(3x^2-4);

$= (3 x^{2} - 4) (x + 5)$ $=(3x^2-4)(x+5)$

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How do you factor by grouping $3 x^{3} + 15 x^{2} - 4 x - 20$ $3x^3 + 15x^2 - 4x - 20$ ?

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How do you factor by grouping 3x3+15x2−4x−203x^3 + 15x^2 - 4x - 20?

1 Answer

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How do you factor by grouping $3 x^{3} + 15 x^{2} - 4 x - 20$ $3x^3 + 15x^2 - 4x - 20$ ?