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  1. AP Pre Calculus
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How do you find the domain of f(x)=log⁡b(g(x))f(x) = \log_b(g(x))f(x)=logb​(g(x))?

  1. Set g(x) > 0. 2. Solve for x. This gives the domain of f(x).
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How do you find the domain of f(x)=log⁡b(g(x))f(x) = \log_b(g(x))f(x)=logb​(g(x))?

  1. Set g(x) > 0. 2. Solve for x. This gives the domain of f(x).

How do you solve for x in the equation log⁡b(x)=c\log_b(x) = clogb​(x)=c?

Rewrite the equation in exponential form: x=bcx = b^cx=bc.

How do you graph y=alog⁡b(x−h)+ky = a\log_b(x - h) + ky=alogb​(x−h)+k?

  1. Identify the vertical asymptote at x = h. 2. Plot a few key points. 3. Sketch the curve, considering the base 'b' and the vertical stretch 'a'.

How do you determine the end behavior of y=log⁡b(x)y = \log_b(x)y=logb​(x) as x approaches 0?

Consider the base 'b'. If b > 1, y approaches negative infinity. If 0 < b < 1, y approaches positive infinity.

How do you determine the end behavior of y=log⁡b(x)y = \log_b(x)y=logb​(x) as x approaches infinity?

Consider the base 'b'. If b > 1, y approaches positive infinity. If 0 < b < 1, y approaches negative infinity.

How do you solve logarithmic equations with multiple logarithms?

  1. Combine logarithms using properties. 2. Convert to exponential form. 3. Solve for x. 4. Check for extraneous solutions.

How do you find the inverse of a logarithmic function?

  1. Replace f(x) with y. 2. Swap x and y. 3. Solve for y. 4. Replace y with f−1(x)f^{-1}(x)f−1(x).

How do you apply transformations to a logarithmic function?

Apply transformations in the correct order: horizontal shifts, stretches/compressions, reflections, and vertical shifts.

How do you check if a solution to a logarithmic equation is extraneous?

Substitute the solution back into the original equation and ensure the argument of each logarithm is positive.

How do you find the x-intercept of a logarithmic function?

Set y = 0 and solve for x.

What is a logarithmic function?

The inverse of an exponential function; 'undoes' exponentiation.

What is the domain of y=log⁡b(x)y = \log_b(x)y=logb​(x)?

x > 0 (positive real numbers)

What is the range of y=log⁡b(x)y = \log_b(x)y=logb​(x)?

All real numbers

What is a vertical asymptote?

A vertical line that the graph of a function approaches but never touches.

What is the argument of a logarithm?

The value inside the logarithm, e.g., 'x' in log⁡b(x)\log_b(x)logb​(x). Must be positive.

What is the base of a logarithm?

The value 'b' in log⁡b(x)\log_b(x)logb​(x). Determines if the function is increasing or decreasing.

What does concavity mean for a logarithmic function?

Describes the curve's shape: either concave up or concave down, but not both.

What is horizontal shift?

A transformation of a graph where the entire graph is moved left or right.

Define end behavior.

Describes how the function behaves as x approaches positive or negative infinity.

What are transformations of functions?

Changes to a function's graph, such as shifts, stretches, or reflections.

What is the general form of a logarithmic function?

y=log⁡b(x)y = \log_b(x)y=logb​(x)

What is the limit of alog⁡b(x)a\log_b(x)alogb​(x) as x approaches 0 from the right?

lim⁡x→0+alog⁡b(x)=±∞\lim_{x \to 0^+} a\log_b(x) = \pm \inftylimx→0+​alogb​(x)=±∞

What is the limit of alog⁡b(x)a\log_b(x)alogb​(x) as x approaches infinity?

lim⁡x→∞alog⁡b(x)=±∞\lim_{x \to \infty} a\log_b(x) = \pm \inftylimx→∞​alogb​(x)=±∞

How do you represent a horizontal shift of a logarithmic function?

g(x)=log⁡b(x+k)g(x) = \log_b(x + k)g(x)=logb​(x+k)

If y=log⁡b(x)y = \log_b(x)y=logb​(x), what is the equivalent exponential form?

by=xb^y = xby=x

What is the logarithmic identity for log⁡b(1)\log_b(1)logb​(1)?

log⁡b(1)=0\log_b(1) = 0logb​(1)=0

What is the logarithmic identity for log⁡b(b)\log_b(b)logb​(b)?

log⁡b(b)=1\log_b(b) = 1logb​(b)=1

What is the change of base formula?

log⁡a(x)=log⁡b(x)log⁡b(a)\log_a(x) = \frac{\log_b(x)}{\log_b(a)}loga​(x)=logb​(a)logb​(x)​

What is the product rule for logarithms?

log⁡b(MN)=log⁡b(M)+log⁡b(N)\log_b(MN) = \log_b(M) + \log_b(N)logb​(MN)=logb​(M)+logb​(N)

What is the quotient rule for logarithms?

log⁡b(MN)=log⁡b(M)−log⁡b(N)\log_b(\frac{M}{N}) = \log_b(M) - \log_b(N)logb​(NM​)=logb​(M)−logb​(N)