hi , need some rearranging this formula $\displaystyle \frac{1}{r} = \frac{1}{q} + \frac{1}{d} $ IF I want to make $\displaystyle r $ the subject of the formula, how would i go about this?
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Hello, Originally Posted by natali.ferno hi , need some rearranging this formula $\displaystyle \frac{1}{r} = \frac{1}{q} + \frac{1}{d} $ IF I want to make $\displaystyle r $ the subject of the formula, how would i go about this? $\displaystyle \frac 1q+\frac 1d=\frac{d+q}{qd}$ So $\displaystyle \frac 1r=\frac{d+q}{qd}$ taking the inverse on both sides : $\displaystyle r=\frac{qd}{q+d}$
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