Respuesta :
Answer:
Given the equation: [tex]d = \frac{LM}{R_2+R_1}[/tex] .....[1]
Cross multiply states that an equation of fractions when each of the side consists of a fraction with a single denominator by multiplying the numerator of each side by the denominator of the other side and equating these two products obtained.
Apply the cross multiply in [1], we get;
[tex]d(R_2 +R_1) = LM[/tex]
Divide both sides by M we get;
[tex]L = \frac{d(R_2+R_1)}{M}[/tex]
or
[tex]L = \frac{dR_2+dR_1}{M}[/tex]
