anonymous
  • anonymous
What is the range of the graph of y = −2x2 − 8x − 7? y ≥ 1 y ≤ 1 y ≤ −2 All real numbers
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
\[y=-2x ^{2}-8x-7\] is this the equation?
anonymous
  • anonymous
if so you need to find the maximum or minimum value of this function. It is quadratic so it will be a parabola and upside down since the x^2 term is negative
anonymous
  • anonymous
how do you find the range?

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anonymous
  • anonymous
The range is all the possible values of y. so since this is a parabola there will be a maximum for y but no minimum. Do you know how to calculate derivatives/
anonymous
  • anonymous
ohh no.
anonymous
  • anonymous
do you have a graphing calculator?
anonymous
  • anonymous
yes
anonymous
  • anonymous
so 1. graph this equation 2. press 2nd and hit the trace button. 3.Choose option number 4 4. move the cursor to the left of the highest point on the graph and press enter 5. move the cursor to the right of the highest point and press enter 6. press enter again 7. look on the bottom of the screen you will see an x= and y= the y value is the maximum value of y and the range is that value and everything else below it. Let me know what you get
anonymous
  • anonymous
y less than or equal to 1?
anonymous
  • anonymous
YUP
anonymous
  • anonymous
yay!! thanks!

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