How do you simplify $- 7 (\frac{5}{7} - \frac{12}{21})$ $-7(5/7 - 12/21)$ ?

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Answer 1 · 2016-04-19T02:44:05

-1

Order of Operations rules require the contents of the brackets to be done first

$\frac{12}{21}$ $12/21$ reduces to $\frac{4}{7}$ $4/7$ when you divide top and bottom by 3

Subtracting $\frac{4}{7}$ $4/7$ from $\frac{5}{7}$ $5/7$ leaves $\frac{1}{7}$ $1/7$

There is no math operational sign between the bracket and the -7 so it is multiplied.

$- 7 \times \frac{1}{7} = - 1$ $-7 xx 1/7 = -1$

How do you simplify −7(57−1221)-7(5/7 - 12/21)?