anonymous
  • anonymous
Sktech, on seperate diagrams, the graphs of each of the following, showing the x- and y-intercepts and also state the coordinates of the maximum or minimum points. 1. y = (x - 1)(x + 7) 2. y = (x + 2)(x - 5) 3. y = 3x^2 - 8x Could someone help me with this? Thx. (:
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
They are equations of parabolas. The maximum or minimum will be at the vertex. The x and y itercepts will be where the parabola crosses the x and y axis. Use the foil method to turn the two factors into an equation. So equation 1 will look like this. \[(x-1)(x+7)=y\]\[x ^{2}+7x-x-7=y\]\[x ^{2}+6x-7=y\] Use geogebra or a graphing calculator to graph each of the equations. http://www.geogebra.org/cms/
anonymous
  • anonymous
Since the vertex is the maximum or minimum, use the vertex formula to find the x value of the vertex. -b/2a The x intercepts occur when y=0 and the y intercept occurs when x=0.

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