Question

Let f(x) = 2(5)?-1. Evaluate f(3) without using a calculator

Answer 1

if we have

f(x)=2(5^(x-1))

for x=3

f(3)=2(5^(3-1))=50

if we have

f(x)=2(5^x)-1

for x=3

f(3)=2(5^3)-1=249