1) expand and simplify:
3) transpose to make t the subject:
The voltage drop, v volts, across and inductor L henrys at time t seconds is given by: v=200e^(-Rt/L)
What time does it take for the voltage to reach 85 volts>
could you go through it step by step if possible and also for the (x-1/x)^2 question.
Thanks BabyMilo for the quick reply.