Answer:
d = √(k/R)
Step-by-step explanation:
Eliminate fractions by multiplying by the denominator, then divide by the coefficient of d². Finally, take the square root.
[tex]R=\dfrac{k}{d^2}\\\\Rd^2=k \quad\text{multiply by $d^2$}\\\\d^2=\dfrac{k}{R} \quad\text{divide by $R$}\\\\d=\sqrt{\dfrac{k}{R}} \quad\text{take the square root}[/tex]
