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Graph Function

Posted on 2016-09-05
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Can you please explain it in a different way?
q12.JPGq13.JPGscreenshot3.jpg
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Question by:mustish1
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6 Comments
 
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Expert Comment

by:phoffric
ID: 41785354
Your approach is done in a straightforward conventional way. Looks good.
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Author Comment

by:mustish1
ID: 41785365
Can you please explain the part 1 that how the values of x and y are plugged in
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LVL 32

Expert Comment

by:phoffric
ID: 41785372
y = y(x) = 2^(-x) = 1/2^(x)
Using your sample values of x:

y(1) = 1/2^(1) = 1/2         ==> (1, 1/2)
y(0) = 1/2^(0) = 1/1 = 1   ==> (0,1)
y(-1) = 1/2^(-1) = 1/ (1/2) = 2 ==> (-1, 2)     // I see that you had (-1, 1/2) even though you had y=2
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LVL 32

Expert Comment

by:phoffric
ID: 41785387
For part 2, you can graph the two curves, i.e., the quadratic and the straight lines, and then get an approximation of g(x).graph_2_curves.pnggraph_2_curves_zoom1.pngFrom the graphs, you can get a rough feel where the intersections of the two graphs are. Then you guess and compute g(x_guess). Then you increment and decrement x_guess by, say, 0.1, and see which g(x) is closer to -8. Now you have a new x_guess. and you modify x_guess by 0.5 in both directions to chose a new x_guess. Keep doing this until the new x_guess is the same as the previous one for the desired number of decimal places.
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Accepted Solution

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phoffric earned 2000 total points
ID: 41785394
To do the numerical approach more efficiently, you can use the newton raphson numerical method approach.
https://en.wikipedia.org/wiki/Newton%27s_method

But you have to come up with two initial guesses that will converge to the two solutions.
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Author Closing Comment

by:mustish1
ID: 41785421
Thank You.
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