The voltage in an electrical circuit is multiplied by itself each time it is reduced. The voltage is 27/125 of a volt and it has been reduced three times. Write the voltage in exponential form. What was the original voltage in the circuit?

Exponential form: F (x) = 3/125^x+1

Original voltage: 3/125 of a volt

The correct answer is:

x³ = 27/125; and

x = 3/5.

Explanation:

Reducing the voltage 3 times would result in multiplying the unknown voltage, x, by itself 3 times; this gives us

x³.

The current voltage is 27/125; this gives us the equation

x³ = 27/125.

To solve this, take the cubed root of both sides:

∛ (x³) = ∛ (27/125)

x = (∛27) / (∛125)

x = (∛ (3*3*3)) / (∛ (5*5*5))

x = 3/5