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4 November, 16:31

Use the grouping method to factor 4x^3 + 20x^2-3x-15

a) (x-5) (4x^2+3)

b) (x+5) (4x^2-3)

c) 2x (x+1) (2x-15)

d) (x^2-5) (4x+3)

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  1. 4 November, 16:52
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    b) (x + 5) (4x^2 - 3).

    Step-by-step explanation:

    4x^3 + 20x^2 - 3x - 15

    = 4x^2 (x + 5) - 3 (x + 5)

    = (x + 5) (4x^2 - 3).
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