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1967 AMC 12 Question 6

AMC12 · 1967 AMC 12

Question 6

If $f(x)=4^x,$ then $f(x+1)-f(x)$ equals:
  1. $4$
  2. $f(x)$
  3. $2f(x)$
  4. $3f(x)$
  5. $4f(x)$