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2 April, 19:19

Simplify the expression (9 + 21) (9 - 21).

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  1. 2 April, 19:48
    0
    -360

    Step-by-step explanation:

    1. Add 9 + 21 and subtract 9 - 21

    2. That would be (30) (-12)

    3. Then multiply 30 x - 12

    4. You get - 360
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