Mathematics Numbers: Absolute Value of Functions I
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1 a place of mind F A C U L T Y O F E D U C A T I O N Department of Curriculum and Pedagogy Mathematics Numbers: Absolute Value of Functions I Science and Mathematics Education Research Group Supported by UBC Teaching and Learning Enhancement Fund
2 Absolute Value of Functions I
3 Absolute Values I Which one of the following tables corresponds to f (), given the table of f () at the right? (Red numbers indicate values that were changed) A. B. C. D. f() f() f() f() f()
4 Solution Answer: B Justification: The table of values of f () are eactly the same as f (), ecept when f () is negative. In this case, the value of f () is made positive by multiplying f () by -1. This corresponds to table B, since every value under the f () column is positive. Table A and C are incorrect because the -values were changed to positive. The domain of f () is always the same as the domain of f (). Table D is incorrect because all values of by -1, not just the negative values. f () where multiplied
5 Absolute Values II The graph of f () is shown below. What is the graph of f ()? A. B. C. D.
6 Solution Answer: A Justification: The graph of f () must lie entirely above or on the -ais since f ( ) 0. Only graph A satisfies this. Notice that the part of f () that was negative has been reflected across the -ais in order to become positive. This is the effect of multiplying f () by -1 when it is negative. f () f ()
7 Solution Cont d Notice the graphs of f () lie completely above or on the - ais. It is not possible for f () to be less than 0 since negative values are turned positive. In this case, the range of f () is f ( ) 0. f () f ()
8 Absolute Values III Which of the following graphs corresponds to the function: f ( ) A. B. C. D.
9 Solution Answer: B Justification: The definition of the absolute value states that: f ( ) f ( ) Notice how the absolute value function is composed of lines, one for when 0 and one for when < 0. Graph D shows the graph of f ( ). What is the equation for graph A? (Write as a piecewise function.)
10 Absolute Values IV Which of the following piecewise functions corresponds to the absolute value graph shown below? A. B. C. D. E.
11 Solution Answer: C Justification: The graph is best described by different lines (one when > and one when < ). Find the equation of these lines individually and combine them into a single function in piecewise notation: Notice that both the lines pass through the point (,0), so the = case can be applied to either line.
12 Alternative Solution Answer: C Justification: First find the equation of the line when <. The slope is - and the y-intercept is 4, so f ( ) 4 when Notice that when, f ( ) 4 is negative. Since the graph shown is an absolute value graph, we multiply f ( ) 4 by -1 when it is negative. Therefore
13 Absolute Values V What is the equation of the graph shown to the right, written with absolute values? A. B. C. D. E. f ( ) 4 f ( ) f ( ) f ( ) Morethan one of the above are correct
14 Solution Answer: E (both A and B are correct) Justification: f ( ) 4 4 Answers A and B are the same because the epressions inside the absolute values only differ by a factor of -1. f ( ) f ( ) When f ( ) 4, the graph is reflected across the -ais when <. When f ( ) 4, the graph is reflected across the -ais when >.
15 Absolute Values VI Which of the following graphs corresponds to the equation: 1 f ( ) A. B. C. D.
16 Solution 1 Answer: D f ( ) Justification: Since units are subtracted from the absolute value, the entire function is shifted units down. Instead of negative values being reflected in the -ais, they will be reflected across the line y = -. This rules out answers A and B. In order to decide between C and D, try finding an ordered pair. If we plug in = 0 into the function, we find that the graph should pass through (0,0): 1 f ( 0) (0) 0 Only C passes though (0,0) (Another strategy to solve this problem is to first graph 1, then shift it down by units.) f ( )
17 Absolute Values VII The graph of f ( ) 1 is shown below. How many solutions are there to the equation 1 1? A. 4 B. 3 C. D. 1 f ( ) 1 E. 0
18 Solution Answer: B Justification: The function f ( ) 1 crosses the line y 1 three times. This means that there are 3 values of where f ( ) 1 1 f ( ) 1 The equation should have 3 solutions. 1 1 y 1 Answer continues on the net slide
19 Solution Cont d Answer: B Justification: The eact 3 solutions can be found by working with the equation. Divide the absolute value into cases: or The 3 solutions are, 0,.
20 Absolute Values VIII The graph of f ( ) does the equation is shown below. For what values of q q have eactly 4 unique solutions? A. B. C. D. E. 0 q 10 0 q 10 0 q 10 0 q 10 q 10
21 Solution Answer: A Justification: If the equation 4 6 q has 4 solutions, the line y q must cross f ( ) 4 6 four times. This happens when q is between: 0 q 10 When q 0, the equation will only have solutions. When q 10, the equation will only have 3 solutions. Notice that it is impossible for this equation to only have 1 solution.
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