Rational Function Extreme Points Standard 4e: Find the extreme points of a rational function (remember that extreme points are y values)

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Presentation transcript:

Rational Function Extreme Points Standard 4e: Find the extreme points of a rational function (remember that extreme points are y values)

We’ve found a number of traits already in Standards 4a, 4b, 4d, and 4e We also talked about critical values but not extreme points. Extreme Points Use the Quotient Rule to find the derivative Find the critical points (where the derivative is 0 or undefined) Make your sign pattern using this information Determine which critical points are maximum, minimum, or neither Find the extreme points by plugging the critical points back into the original function Check your work on the graphing calculator We did not yet discuss the specifics of the domain of a rational function

= 0 or undefined Numerator = 0 or Denominator = 0 Find the extreme points of Denominator = 0 Numerator = 0 VA’s, zeros, POE’s first… Zero: at x = –6, 0 Vertical Asymptote: at x = 2 Point of Exclusion: None Numerator = 0 and Denominator = 0 Never Zeros: VA’s: Because the function is not defined at x = 2 the domain of this function is or

Zero: at x = –6, 0 Vertical Asymptote: at x = 2 Point of Exclusion: None Because the function is not defined at x = 2 the domain of this function is or An even simpler way to look at domain in a rational function: The domain is every value of x except where there are POE’s and VA’s

= 0 or undefined Numerator = 0 or Denominator = 0 Find the extreme points of Denominator = 0 Numerator = 0

Find the extreme points of Denominator = 0 Numerator = 0 00 undef +– + – To find the extreme points we plug our critical points back into the original function: When

 VA at x = 2 (6, 18) (–2, 2) Extreme Value (relative min) Critical point Extreme Value (relative max) Critical point