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# Comparing Graphs : First and Second Derivatives

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X -1.5 -1.0 -0.5 0 0.5 1.0 1.5

f(x) -1 -4 -6 -7 -6 1.0 -7

f'(x) -7 -5 -3 0 3 5 7

Let f be a function that is differentiable for all real numbers. The table above gives the values of f and its derivative f' for selected points x in the closed interval -1.5 < or equal x < or equal 1.5. The second derivative of f has the property that f''(x)>0 for -1.5<or equalx< or equal 1.5

Let graph of g be the function given by
2x^2-x-7 for x<0
g(x) = and
2x^2+x-7 for x>or equal 0

The graph of g passes through each of the points (x,f(x)) given in the table above. Is it possible that f and g are the same function? Give a detailed reason for your answers

##### Solution Summary

First and second derivatives are used to compare functions.
The solution is detailed and well presented.

Solution provided by:
###### Education
• BSc , Wuhan Univ. China
• MA, Shandong Univ.
###### Recent Feedback
• "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
• "excellent work"
• "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
• "Thank you"
• "Thank you very much for your valuable time and assistance!"

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