Gr 10 Math Ch 5: Exponential Function

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Questions and Answers

What is the domain of an exponential function of the form $y = ab^x + q$?

  • Only integers
  • All real values of $x$ (correct)
  • All negative real numbers
  • All positive real numbers

For the function $y = -2(3^x) + 1$, which direction does the graph curve?

  • It is a straight line
  • Downwards (correct)
  • Upwards
  • Sideways

What effect does a positive value of $q$ have on the graph of $y = ab^x + q$?

  • Shifts the graph vertically upwards (correct)
  • Shifts the graph to the right
  • Shifts the graph vertically downwards
  • Shifts the graph to the left

If $y = 5(2^x) - 3$, what is the horizontal asymptote of this function?

<p>$y = -3$ (B)</p> Signup and view all the answers

For an exponential function to represent decay, which condition must be true?

<p>$0 &lt; b &lt; 1$ (C)</p> Signup and view all the answers

What is the y-intercept of the function $y = 4(3^x) - 2$?

<p>-2 (D)</p> Signup and view all the answers

If $y = ab^x + q$ and $a = -1$ with $b = rac{1}{2}$, what type of graph does the function create?

<p>Exponential decay that opens downwards (D)</p> Signup and view all the answers

For the function $y = 3(5^x) + 4$, which statement about the graph is true?

<p>It has a horizontal asymptote at $y = 4$ (B)</p> Signup and view all the answers

What is the effect of the parameter $a$ on the orientation of the graph of an exponential function?

<p>It determines whether the graph curves upwards or downwards. (A)</p> Signup and view all the answers

What is the y-intercept of the function expressed as $y = 7(1.5^x) - 4$?

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

Which horizontal line represents the asymptote for the function $y = -3(2^x) + 5$?

<p>y = 5 (B)</p> Signup and view all the answers

For the exponential function $y = -4(3^x)$, how does the sign of $b$ affect the function?

<p>It has no effect on the function since $b$ must always be positive. (A)</p> Signup and view all the answers

In the exponential function $y = 5(0.5^x) + 2$, what type of behavior does the graph represent?

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

What characteristic describes the range of an exponential function where $a < 0$?

<p>The range is less than the horizontal asymptote value. (D)</p> Signup and view all the answers

When sketching the graph of an exponential function, what is considered the first step?

<p>Identify the sign of parameter $a$. (D)</p> Signup and view all the answers

If an exponential function has a $q$ value of -3, what can be inferred about its horizontal asymptote?

<p>It is at y = -3. (B)</p> Signup and view all the answers

What happens to the horizontal asymptote of the graph when the parameter $q$ is modified?

<p>It shifts vertically by $q$ units. (C)</p> Signup and view all the answers

In the function $y = -5(2^x) + 3$, which characteristic indicates the graph curves downwards?

<p>The parameter $a$ being negative. (D)</p> Signup and view all the answers

For an exponential function to exhibit growth, which condition must the base $b$ meet?

<p>It must be greater than 1. (B)</p> Signup and view all the answers

Which of the following describes the range of an exponential function where $a > 0$?

<p>The range is $ ext{greater than } q$. (B)</p> Signup and view all the answers

When sketching the graph of $y = 3(0.7^x) - 1$, what is the first characteristic to determine?

<p>The horizontal asymptote. (C)</p> Signup and view all the answers

What describes the range of the function $y = -2(1.5^x) + 4$?

<p>The function values are below 4. (D)</p> Signup and view all the answers

For the function $y = 0.5(4^x) + 2$, how does the value of $b$ affect the growth rate?

<p>A higher value results in faster growth. (B)</p> Signup and view all the answers

Which situation would lead to an exponential decay graph?

<p>$a &lt; 0$ and $0 &lt; b &lt; 1$. (D)</p> Signup and view all the answers

How does changing the value of $a$ affect the graph of the function $y = ab^x + q$?

<p>It affects whether the graph curves upwards or downwards. (B)</p> Signup and view all the answers

Which of the following conditions must be met for the graph of $y = ab^x + q$ to possess a horizontal asymptote?

<p>The function must include a vertical shift ($q$). (A)</p> Signup and view all the answers

In an exponential function given by $y = ab^x + q$, what impact does setting $b$ to a value between 0 and 1 have?

<p>The function will always exhibit exponential decay. (A)</p> Signup and view all the answers

Which of the following statements about the y-intercept of an exponential function $y = ab^x + q$ is correct?

<p>It can be determined using the formula $f(0) = a + q$. (D)</p> Signup and view all the answers

What does the presence of a negative value for $a$ indicate about the graph of the function $y = ab^x + q$?

<p>The graph will always be below the horizontal asymptote. (C)</p> Signup and view all the answers

For an exponential function to exhibit growth, which condition regarding the base $b$ must be satisfied?

<p>$b$ must be greater than 1. (D)</p> Signup and view all the answers

When analyzing the function $y = 3(2^x) - 5$, what impact does $q = -5$ have on the graph?

<p>It shifts the graph vertically downwards by 5 units. (D)</p> Signup and view all the answers

What characteristic of the graph can be determined by the intercepts of the function $y = ab^x + q$?

<p>Both intercepts give information about the growth or decay of the function. (D)</p> Signup and view all the answers

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