Indices and Logarithms Problems

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Questions and Answers

Given that $\ln a = x$ and $\ln b = y$, what is the expression for $\ln \frac{a^2b}{e}$ in terms of $x$ and $y$?

  • $2x + y + 1$
  • $2xy + 1$
  • $2x + y - 1$ (correct)
  • $2x + y + 1$
  • None of the above

What constant value $k$ satisfies $3^x = e^{kx}$ for all $x$?

  • $3 \ln 3$
  • $\ln 2$
  • $2 \ln 2$
  • $\ln 3$ (correct)
  • $1$

If $r = \frac{q}{p}$, determine the value of $\frac{\log_q r}{\log_q p}$.

  • $pq$
  • $\frac{r}{q}$ (correct)
  • $\frac{q}{r}$
  • $\frac{1}{pq}$
  • $rp$

What is the simplified form of the expression $\frac{3^{x+1} \cdot 9^x}{(27^x)^{2/3}}$?

<p>$3^{x+1}$ (C)</p> Signup and view all the answers

Assuming base 10 logarithm, solve for $x$ in the equation $\log(5x + 6) = 2\log(5x - 6)$.

<p>$x = 2, \frac{3}{5}$ (A)</p> Signup and view all the answers

Given all logarithms are to base 9, simplify the following expression: $\frac{(\log 16)(\log 27)}{(\log 9)(\log 64)}$

<p>$\frac{1}{2}$ (B)</p> Signup and view all the answers

Solve the following equation for $x$: $2\log_4 x = \log_4 9$.

<p>$3$ (A)</p> Signup and view all the answers

Solve for $x$: $2e^{2x} - 5e^x = 12$.

<p>$\ln 4$ (D)</p> Signup and view all the answers

Determine the solution for $x$ in the equation: $\log_a(8 - x) - \log_a(2 - x) = \log_a 3$.

<p>$-1$ (D)</p> Signup and view all the answers

Express the following in its simplest radical form: $\sqrt{\frac{2x^2\sqrt{2}y^5}{5\sqrt{x}y^2}}$

<p>$\frac{2\sqrt{2}y}{5x}$ (B)</p> Signup and view all the answers

Determine the value of $x$ if $\log_6 x - \log_6 3 = 2$.

<p>$64$ (A)</p> Signup and view all the answers

Evaluate $2^{3\log_2 4}$.

<p>$64$ (A)</p> Signup and view all the answers

Solve the equation $3^{2x} = 9^{2-x}$, expressing your answer to three significant figures.

<p>$1.33$ (B)</p> Signup and view all the answers

Find the root of the equation $e^{2-2x} = 2e^{-x}$, giving your answer exactly, in terms of logarithms.

<p>$2 - \ln 2$ (A)</p> Signup and view all the answers

Simplify: $\frac{x^5y^{-2}}{(x^3y)^2}$

<p>None of the above (E)</p> Signup and view all the answers

Simplify the expression: $\log_2 3 \cdot \log_3 4 \cdot \log_4 5 \cdot \log_5 6 \cdot \log_6 7 \cdot \log_7 8$

<p>$3$ (D)</p> Signup and view all the answers

Simplify $\left( \frac{4^{2x-2}y^{5-3}}{x^2} \right)^{\frac{3}{2}}$

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If $x^{3/2} - 5x^{3/4} - 36 = 0$, what is the value of $x$?

<p>$9$ (A)</p> Signup and view all the answers

Given $\log_a (8 - x) - \log_a (2 - x) = \log_a 3$, solve for $x$.

<p>-1 (C)</p> Signup and view all the answers

Given that all logarithms are to the base 9, simplify this expression: $\frac{(\log{16})(\log{27})}{(\log{9})(\log{64})}$

<p>$\frac{1}{2}$ (E)</p> Signup and view all the answers

Solve for $x$: $2\log_{4}{x}=\log_{4}{9}$

<p>3 (D)</p> Signup and view all the answers

Express in simplest radical form: $\sqrt{\frac{2x^{2}\sqrt{2}y^{5}}{5\sqrt{x}y^{2}}}$

<p>$\frac{2}{5x}\sqrt{2}y$ (A)</p> Signup and view all the answers

Given that $\log_{6}{(x)}-\log_{6}{(3)}=2$, solve for $x$.

<p>108 (B)</p> Signup and view all the answers

What is the value of $2^{3\log_{2}{4}}$

<p>64 (D)</p> Signup and view all the answers

Flashcards

Simplify 3 * 9n / (27n)^(2/3)

Simplifies to 3.

Solve log(5x+6) = 2log(5x-6).

x = 2, assuming base 10.

Simplify (log√16)(log 27)/[(log 9)(log 64)].

1/2

Solve 2 log₄x = log₄9

x = 3

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Solve for x: 2e^(2x) - 5e^x = 12

ln 4, ln(-3/2)

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Solve for x: logₐ(8-x) - logₐ(2-x) = logₐ3

x = -1

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Simplify: (2^(5/2)x^(3/2)y^(1/2)) / (5x^(1/2)y^(3/2))

2√2x / (5y)

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Solve for x: log₆x - log₆3 = 2

x = 108

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Evaluate 2^(3log₂4)

64

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Solve 3^(2x) = 9^(2-x)

x = 1, giving your answer to three significant figures.

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If logq r = p, evaluate logr q

r/q

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If In a = x and In b = y, express In(a^2b)/e

2x + y - 1

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Find constant k, where 3^x = exp(kx)

k = ln 3

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Find the root of e^(2-2x) = 2e^(-x).

2 - ln 2

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Simplify x⁵y⁻² / (x⁻³y)⁻²

x^(11)y^4

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Simplify log₂3 ⋅ log₃4 ⋅ log₄5 ⋅ log₅6 ⋅ log₆7 ⋅ log₇8.

2

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Simplify (4^(1/3)x^(-2)y^(5/3))^(-3)

216y⁻¹⁵/x¹²

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Solve x^(1/2) - 5x^(1/4) - 36 = 0

9

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Study Notes

  • Study notes for the provided mathematics problems with topics on indices and logarithms.

2006, Q19

  • Simplify: 3^1 * 9^n / (27^n)^(2/3)
  • Solution: 3^(1-n)

2006, Q20

  • Solve for x: log(5x + 6) = 2log(5x - 6)
  • Solution: x = 2, 3/5

2006, Q35

  • Simplify: (log16 * log27) / (log9 * log64)
  • Assume all logs are base 9.
  • Solution: 1/2

2008/09, Q27

  • Solve: 2log4 x = log4 9
  • Solution: x = 3

2008/09, Q35

  • Solve for x: 2e^(2x) - 5e^x = 12
  • Solution: x = ln 4, ln(-3/2)

2010/11, Q3

  • Solve for x: loga(8 - x) - loga(2 - x) = loga 3
  • Solution: x = 2

2010/11, Q9

  • Simplify: (2^(5/2) * x^3 * y^2) / (5√x^2y)
  • Simplest radical form: (2√2x) / (5y)

2010/11, Q16

  • Solve: log6 x - log6 3 = 2
  • Solution: x = 108

2010/11, Q17

  • Evaluate: 2^(3log2 4)
  • Solution: 64

2012/13, Q19; 2014/15, Q20

  • Solve the equation: 3^(2x) = 9^(2-x)
  • Solution: x = 1.33

2012/13, Q21; 2014/15, Q28

  • Solve: logq r * logq r = p, evaluate logr p
  • Solution: pq

2013/14, Q17

  • Given: ln a = x and ln b = y, express ln(a^2 * b)
  • Solution: 2x + y

2013/14, Q23

  • State the exact value of k, when 3^x = exp(kx)
  • Solution: k = ln 3

2013/14, Q44

  • Find the root of the equation e^(2-2x) = 2e^(-x)
  • Solution: 2 - ln2

2013/14, Q59

  • Simplify: (x^5 * y^-2) / (x^3 * y)^2
  • Solution: x^(-1) * y^(-4)

2016/17 (TEST), Q1

  • Simplify: log2 3 * log3 4 * log4 5 * log5 6 * log6 7 * log7 8
  • Solution: 3

2018/19, Q25 (TEST, TYPE A)

  • Simplify: (8x^(2-2) * y^(5-3)) / x^2
  • Solution: (216y^(-15)) / (x^(-12))

2018/19, Q12 (EXAM, TYPE D)

  • Solve for x: x^(3/2) - 5x^(3/4) - 36 = 0
  • Solution: x = 27

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