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16 November, 23:37

Raul simplified the expression, as shown below. - [3h + 7h (2 - h) ] = - [10h (2 - h) ] = - [20h - h] = - 19h Describe the error (s) in Raul's work.

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  1. 16 November, 23:43
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    He should have worked out 7h (2 - h) first before adding the 3h. (first step)

    2nd step he multiplied the 2 by - 10h but he also should have multiplied the - h by the - 10h (Distributive law)
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