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  1. AP Pre Calculus
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What does the graph of y=log⁡b(x)y = \log_b(x)y=logb​(x) with b > 1 tell us?

The function is increasing, and the graph is concave down.

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What does the graph of y=log⁡b(x)y = \log_b(x)y=logb​(x) with b > 1 tell us?

The function is increasing, and the graph is concave down.

What does the graph of y=log⁡b(x)y = \log_b(x)y=logb​(x) with 0 < b < 1 tell us?

The function is decreasing, and the graph is concave down.

How does a vertical asymptote appear on the graph of a logarithmic function?

As a vertical line that the graph approaches but never crosses, indicating a domain restriction.

How does a horizontal shift affect the graph of a logarithmic function?

It moves the entire graph left or right, changing the position of the vertical asymptote.

What does a reflection across the x-axis do to the graph of a logarithmic function?

It inverts the function, changing increasing functions to decreasing and vice versa.

How can you identify the base of a logarithmic function from its graph?

Look for a point (x, y) on the graph and solve for b in the equation by=xb^y = xby=x.

What does the steepness of a logarithmic graph indicate?

It indicates the rate of change of the function. Steeper graphs have a faster rate of change near the asymptote.

How does the graph of y=log⁡b(x)y = \log_b(x)y=logb​(x) relate to the graph of y=bxy = b^xy=bx?

They are reflections of each other across the line y = x.

What does a vertical stretch of a logarithmic function look like on its graph?

The graph appears to be stretched vertically away from the x-axis.

How can you determine the domain of a transformed logarithmic function from its graph?

Identify the vertical asymptote; the domain is all x-values greater than (or less than, depending on reflection) the asymptote's x-value.

What are the differences between exponential growth and logarithmic growth?

Exponential: Rapid increase, unbounded | Logarithmic: Slow increase, bounded by asymptote.

What are the differences between y=log⁡b(x)y = \log_b(x)y=logb​(x) and y=−log⁡b(x)y = -\log_b(x)y=−logb​(x)?

log⁡b(x)\log_b(x)logb​(x): Increasing (if b > 1), positive y-values for x > 1 | −log⁡b(x)-\log_b(x)−logb​(x): Decreasing (if b > 1), negative y-values for x > 1.

What are the differences between horizontal and vertical shifts of y=log⁡b(x)y = \log_b(x)y=logb​(x)?

Horizontal: Changes the domain and asymptote | Vertical: Changes the range (though range is all real numbers).

What are the differences between log⁡(x∗y)\log(x*y)log(x∗y) and log⁡(x+y)\log(x+y)log(x+y)?

log⁡(x∗y)\log(x*y)log(x∗y): Can be expanded to log⁡(x)+log⁡(y)\log(x) + \log(y)log(x)+log(y) | log⁡(x+y)\log(x+y)log(x+y): Cannot be simplified further.

What are the differences between log⁡b(x)\log_b(x)logb​(x) where b > 1 and 0 < b < 1?

b > 1: Increasing function | 0 < b < 1: Decreasing function.

What are the differences between the domain and range of exponential and logarithmic functions?

Exponential: Domain is all real numbers, range is y > 0 | Logarithmic: Domain is x > 0, range is all real numbers.

What are the differences between the graphs of y=log⁡b(x)y = \log_b(x)y=logb​(x) and y=bxy = b^xy=bx?

log⁡b(x)\log_b(x)logb​(x): Vertical asymptote at x = 0 | bxb^xbx: Horizontal asymptote at y = 0. They are reflections across y = x.

What are the differences between solving logarithmic and exponential equations?

Logarithmic: Often involves combining logs and converting to exponential form | Exponential: Often involves isolating the exponential term and taking the logarithm of both sides.

What are the differences between the effects of vertical stretches and compressions on logarithmic functions?

Vertical Stretch: Makes the graph steeper | Vertical Compression: Makes the graph less steep.

What are the differences between the product rule and quotient rule for logarithms?

Product Rule: log⁡b(MN)=log⁡b(M)+log⁡b(N)\log_b(MN) = \log_b(M) + \log_b(N)logb​(MN)=logb​(M)+logb​(N) | Quotient Rule: 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)

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)