Vivian O.

asked • 07/16/15# Divide 7-j\10 divide j-7\15

Divide 7-j\10 divide j-7\15

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## 1 Expert Answer

Edward C. answered • 07/17/15

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Caltech Grad for math tutoring: Algebra through Calculus

If the problem is (7-j)/10 divided by (j-7)/15 then the way to divide one fraction by another is to invert (or take the reciprocal of) the second fraction and then multiply the two fractions. This leads to

[(7-j)/10] * [15/(j-7)]

Note that (7-j) is the negative of (j-7), meaning (7-j) = -(j-7). So if you replace the (7-j) in the first fraction with -(j-7) then the two (j-7) terms will cancel leaving you with

[-1/10] * [15/1] = -15/10 = -3/2

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Jayden H.

07/16/15