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Lesson 6: Solving Exponential and Logarithmic Equations — Practice Questions

  1. 1. Solve the equation for $x$: $3^{2x-1} = \frac{\sqrt{3}}{9}$. $x = $ ___

  2. 2. Solve the equation for $x$: $27^{x+2} = 81^{x-1}$. $x = $ ___

  3. 3. Solve the equation for $x$: $16^{2-3x} = 64^{x+5}$. $x = $ ___

  4. 4. Which of the following pairs of functions have identical graphs? Consider $h(x) = 6^x$, $k(x) = (\frac{1}{6})^x$, $m(x) = 6^{-x}$, and $n(x) = \frac{1}{6^x}$.

    • A. $h(x)$ and $k(x)$
    • B. $k(x)$ and $m(x)$
    • C. $h(x)$ and $m(x)$
    • D. $h(x)$ and $n(x)$
  5. 5. Solve for the larger value of $x$: $5^{x^2-x-4} = 25$. $x = $ ___

  6. 6. Solve the equation for $x$: $5^{x+2} = 25^{4/3}$. $x = $ ___

  7. 7. An outbreak of a disease doubles the number of cases every 6 days. If there are 26 cases initially, after how many days will there be 106,496 cases? ___

  8. 8. Use the laws of exponents to simplify the expression $b^{t/2} b^{t/2}$.

    • A. $b^{t^2/4}$
    • B. $b^{t/4}$
    • C. $b^t$
    • D. $b^{2t}$
  9. 9. Use the laws of exponents to simplify the expression $(3^x)^4$.

    • A. $3^{x+4}$
    • B. $3^{x^4}$
    • C. $3^{4x}$
    • D. $12^x$
  10. 10. Use the laws of exponents to simplify the expression $\frac{8^{2x}}{8^x}$.

    • A. $8^x$
    • B. $8^2$
    • C. $1^x$
    • D. $8^{2x^2}$