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21 June, 03:52

How are the expressions 8-15 and 8 - (-15) ? how are they different?

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  1. 21 June, 07:22
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    8 - 15 means subtract the positive number 15 from 8.

    8 - 15 = 8 + (-15) = - 7

    8 - (-15) means subtract the negative number - 15 from 8.

    Subtracting a negative number is the same as adding a positive number.

    8 - (-15) = 8 + 15 = 23

    8 - 15 = - 7, and 8 - (-15) = 23. The expressions mean different operations and have different answers.
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