Make r subject of the formula given that \(\frac{x}{r+a}=\frac{a}{r}\)
a
\(\frac{a^{2}}{(x-a)}\)
b
\(\frac{a^{2}}{(x+a)}\)
c
\(\frac{a}{x-a}\)
d
\(\frac{a}{x+a}\)
Explanation
Correct Option
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mercy gokie
10 years ago
To make r subject of formula.
x/r+a = a/r(cross multiply)
rx=ar+a^2(collect like terms)
rx-ar=a^2
r(x-a)=a^2(divide both sides by x-a)
r=a^2/x-a
