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6 March, 08:14

Simplify (x - 1) (x2 + 5x + 2).

x3 + 6x2 + 7x - 2

x3 + 4x2 - 3x - 2

x3 - x2 + 2x - 2

x3 + 5x2 - 6x - 2

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Answers (1)
  1. 6 March, 08:40
    0
    Distribute

    pretend the x²+5x+2 part is the a in

    a (b+c) = ab+ac

    so

    (x-1) (x²+5x+2) =

    (x²+5x+2) (x-1) =

    (x²+5x+2) (x) + (x²+5x+2) (-1) =

    x³+5x²+2x-x²-5x-2=

    x³+4x²-3x-2

    2nd option
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