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15 June, 16:25

Select the polynomial that can be factored as (4x-5) (16x^2+20x+25)

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  1. 15 June, 16:38
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    f (x) = 64x³ - 125

    Multiply each term in the second factor by each term in the first factor

    = 4x (16x² + 20x + 25) - 5 (16x² + 20 x + 25)

    =64x³ + 80x² + 100x - 80x² - 100x - 125

    = 64x³ - 125 ← difference of cubes
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