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1972 AMC 12 Question 6

AMC12 · 1972 AMC 12

Question 6

If $3^{2x}+9=10(3^x),$ then the value of $x^2+1$ is:
  1. $1$ only
  2. $5$ only
  3. $1$ or $5$
  4. $2$
  5. $10$