anonymous
  • anonymous
The function f(x) = −x2 + 50x − 264 models the profit, in dollars, a yoga studio makes for selling monthly memberships, where x is the number of memberships sold and f(x) is the amount of profit. Part A: Determine the vertex. What does this calculation mean in the context of the problem? (5 points) Part B: Determine the x-intercepts. What do these values mean in the context of the problem? (5 points)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
medal
freckles
  • freckles
\[f(x)=-x^2+50x-264 \\ \text{ factor } -1 \text{ from the first two terms } \\ f(x)=-(x^2-50x)-264 \\ \text{ now I'm going to leave a little space in the ( )} \\ \text{ this space will be the number we put into complete the square } \\ \text{ but whatever I add in } \\ \text{ I have to subtract out } \\ f(x)=-(x^2-50x+?)-264+? \\ \text{ notice I added in a zero } -?+?=0\]
freckles
  • freckles
now it is time to figure what number that ? should be

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freckles
  • freckles
do you know how to complete the square?
anonymous
  • anonymous
kinda
freckles
  • freckles
okay so what number should the ? be
freckles
  • freckles
hint: \[x^2+kx+(\frac{k}{2})^2 \text{ is equal to } (x+\frac{k}{2})^2 \]
anonymous
  • anonymous
2 ?
anonymous
  • anonymous
am i right
anonymous
  • anonymous
hello?
freckles
  • freckles
hmm... how did you get that?
anonymous
  • anonymous
when you complete a square arent you suposed to add in a 2
freckles
  • freckles
did you read this? \[x^2+kx+(\frac{k}{2})^2 \text{ is equal to } (x+\frac{k}{2})^2 \\ \]
freckles
  • freckles
\[x^2-50x+... \text{ is the same as } x^2+kx... \text{ when } k=-50 \\ x^2+kx+(\frac{k}{2})^2=(x+\frac{k}{2})^2 \\ x^2-50x+...=(x+..)^2 \\ \]
freckles
  • freckles
I left those spaces for you what number should be in place of first space, the space that has 3 dots in it

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