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24 December, 16:03

Express the product of 2x^2+6x-8 and x+3 in standard form

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  1. 24 December, 16:25
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    The answer is 2x³ + 12x² + 10x - 24

    (2x² + 6x - 8) (x + 3) = x (2x² + 6x - 8) + 3 (2x² + 6x - 8) =

    = 2x³ + 6x² - 8x + 6x² + 18x - 24 =

    = 2x³ + (6x² + 6x²) + (-8x + 18x) - 24 =

    = 2x³ + 12x² + 10x - 24
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