R(r1+r2)= r1r2

Question

the ones and twos are as in base one and base two. solve for r2

Answer 1

R(r₁ + r₂) = r₁r₂ 

R r₁  +  R r₂  =  r₁ r₂ 

R r₂  –  r₁ r₂  = - R r₁ 

r₂ (R  –  r₁)  =  - R r₁

.                R r₁
r₂  =  –  —————
.            (R  –  r₁)