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anonymous
 one year ago
f(x)=1/2x^2+7x2. x=7. Im trying to find the vertex, one is 7, and the other is 45/2. I keep getting 49/2. what am I missing?
anonymous
 one year ago
f(x)=1/2x^2+7x2. x=7. Im trying to find the vertex, one is 7, and the other is 45/2. I keep getting 49/2. what am I missing?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0what does "one is 7" mean?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0first coordinate of the vertex is always \(\frac{b}{2a}\) in your case \(a=\frac{1}{2},b=7\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ooh i see "one is 7" means the first coordinate is 7

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[f(7)=\frac{1}{2}\times 7^2+7\times 72\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0that was supposed to be x=7 not one is 7

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i see exactly what you are missing you did not subtract 2 at the end

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0if I subtract 2 from \[\frac{ 49 }{ 2}\] how does that equal \[\frac{ 45 }{ 2 }\]?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the vertex is (7, 45/2). I cant figure out how its not 49/2. the class im in offers no explanation as to how it gets the answers, so im floored on how 7x7 equals 45.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0did you get that you find the second coordinate of the vertex by finding \[f(7)=\frac{1}{2}\times 7^2+7\times 72\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes, I got that far find and this is what I did, in order (7)^2=49. 7x7=492=47 so then I have \[\frac{ 1 }{ 2 }(49)+47\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0you lost me entirely

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\frac{1}{2}\times 7^2+7\times 72\\ \frac{1}{2}\times 49+472\\ \frac{49}{2}+\frac{98}{2}2\\ \frac{49}{2}2\\ \frac{45}{2}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0typo there , the second line should have 2 49's in it

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0just remember \[2 = \frac{4}{2}\]

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0so you have \[\frac{49}{2}  \frac{4}{2} = \frac{45}{2}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay thank you I didn't know how to get the second fraction. I see it know. I wish my class program would just explain it seesh. thanks again!
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