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14 June, 08:35

Expand & simplify: (x + 1) (x + 3)

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  1. 14 June, 08:52
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    (x+1) (x+3)

    Reorder terms: (x+1) (x+3)

    Multiply: (x) (x) + (x) (3) + (1) (x) + (1) (3)

    Combine them:x^2+3x+x+3

    Then combine 3x and x together which equals to 4x

    Answer is: x^2+4x+3
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