Lesson #1: Exponential Functions and Their Inverses Day 2
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1 Unit 5: Logarithmic Functions Lesson #1: Exponential Functions and Their Inverses Day 2 Exponential Functions & Their Inverses Exponential Functions are in the form. The inverse of an exponential is a reflection in the line. The and coordinates are swapped. Inverse of the exponential function : Solve for : log Unit 8 1
2 Properties of a Logarithmic Function The domain is all positive real numbers 0or 0,. The range is all real numbers,,. The vertical asymptote is located at 0 (the -axis). The intercept is (1,0). Example 1: Graph of 2. Unit 8 2
3 Transformations of Logarithmic Functions Using HSRV Logarithmic Functions and Reflections Recall, when reflecting over the axis, the value is negated. The vertical asymptote remains at 0. Unit 8 3
4 Logarithmic Functions and Reflections Recall, when reflecting over the axis, the value is negated. The vertical asymptote remains at 0. Logarithmic Functions and Translations If h is positive, the graph shifts to the right units. (Remember: if h looks negative h is positive) If h is negative, the graph shifts to the left units. (Remember: if h looks positive h is negative) The line is the vertical asymptote. The domain is. The range is, or all real numbers. Unit 8 4
5 Logarithmic Functions and Translations If is positive, the graph shifts up units. If is negative, the graph shifts down units. If 1, the graph moves up to the right,. If 0 1 the graph moves down to the right. Logarithmic Functions: Stretch & Shrink If 1, multiply each coordinate of by, vertically stretching the graph of by the factor of. If 0 1, multiply each coordinate of by, vertically shrinking the graph of by the factor of. If 1, divide each coordinate of by, horizontally shrinking the graph of by the factor of. If 0 1, divide each coordinate of by, horizontally stretching the graph of by the factor of. Unit 8 5
6 Transformations of Functions Recall: Combinations of Transformations: A function involving more than one transformation can be graphed by performing transformations in the following order: 1. Horizontal Shifting 2. Stretching or Shrinking 3. Reflecting 4. Vertical Shifting Ex 1: Describe the graph of 2log 1. Transformation: H none S vertical stretch by factor of 2 (multiply s by 2) R reflect over the axis V up 1 Domain: or, Range:, Asymptote: Unit 8 6
7 Ex 2: Describe the graph of log Transformation: H left 3 S horizontal shrink by factor of 2 (divide s by 2) R none V down 4 Domain: or, Range:, Asymptote: Ex 3: Use the graph of log and transformations to sketch the graph of log 1 4. Also, find the domain and vertical asymptote of. H left 1 unit S none R none V up 4 units Domain:, Unit 8 7
8 Ex 4: Use the graph of log and transformations to sketch the graph of 2log 4 1. Also, find the domain & vertical asymptote of. H left 4 units S vertical stretch by factor (multiply values by ) R none V down 1 unit Domain:, Ex 5: Use the graph of log and transformations to sketch the graph of log 5 4. Also, find the domain & vertical asymptote of. H left 5 units S horizontal stretch by factor (divide values by ) R reflection over axis (negate values) V down 4 units Domain:, Unit 8 8
9 Ex 6: Determine the domain and vertical asymptote of the graph of log Recall: Domain of a logarithmic function is all real numbers greater than zero. Domain:, Ex 7: Determine the domain and vertical asymptote of the graph of log Domain:, Unit 8 9
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