anonymous
  • anonymous
f(x)=610x^2-10,250x+1,235 determine the max or min and write answer as a coordinate????
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Mertsj
  • Mertsj
I see it has a minimum. Do you see that?
anonymous
  • anonymous
yes because it's postive right
Mertsj
  • Mertsj
Yes.

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Mertsj
  • Mertsj
And that minimum is the vertex. Right?
anonymous
  • anonymous
right
Mertsj
  • Mertsj
And the x coordinate of the vertex can easily be found because we know that x = -b/2a Right?
anonymous
  • anonymous
right
anonymous
  • anonymous
oh by the way it says x=.28 and then it says to determine the min and write as coordinate, idk if .28 makes any difference
Mertsj
  • Mertsj
And -b/2a= 10250/1220=8.40
Mertsj
  • Mertsj
Maybe you'd better post the entire problem.
anonymous
  • anonymous
ok hold on
anonymous
  • anonymous
evaluate each expression below for x=.28. determine the max or min of f(X)=610x^2-10250x+1235. write answer as a coordinate.
Mertsj
  • Mertsj
Ok. We can do that at the end. Right now we're in the middle of finding the vertex. So do you agree that the x coordinate of the vertex is 8.40?
anonymous
  • anonymous
yes i agree
Mertsj
  • Mertsj
So now we can find the y coordinate of the vertex by replacing x with 8.40 and evaluating the expression.
Mertsj
  • Mertsj
I got -41823.4 What did you get?
anonymous
  • anonymous
-4.18234
Mertsj
  • Mertsj
How did you get a decimal point after the 4?
anonymous
  • anonymous
let me calculate it again ok
Mertsj
  • Mertsj
The numbers are right. just the decimal is off.
Mertsj
  • Mertsj
maybe your calculator is in scientific notation mode and it has an exponent of 4. Could that be?
anonymous
  • anonymous
is cuz i set it to round and it's literallly going crazy so let's go with ur answer ok
Mertsj
  • Mertsj
Ok. Now we know the vertex is (8.4,-41823.4)
Mertsj
  • Mertsj
And now we have to plug in the .28 and find the value of the expression for that x value.
anonymous
  • anonymous
ok
Mertsj
  • Mertsj
I got -6917.176 What did you get?
anonymous
  • anonymous
-6.917176
anonymous
  • anonymous
the decimal again
Mertsj
  • Mertsj
you've got to get your calculator out of scientific notation mode. Do you have a EE button?
Mertsj
  • Mertsj
It automatically gives you your answers in scientific notation and you are overlooking the number at the upper right of the screen that tells you the exponent of the 10
anonymous
  • anonymous
i redid it and now i got -1.59??????
Mertsj
  • Mertsj
I'll do it again. I'll bet that every problem you do, you get an answer between 1 and 10. Am I right? Enter 20 times 500
anonymous
  • anonymous
1.00
Mertsj
  • Mertsj
There you go. Of course 20 times 500 is 10000 not 1. Did you look for a little number at the upper right of your screen? It should be a 4
Mertsj
  • Mertsj
In any case, I've double checked it a number of times. f(.28)=-1587.176
anonymous
  • anonymous
so ok then how do i write it as a coordinate?
Mertsj
  • Mertsj
(.28,-1587.176)
Mertsj
  • Mertsj
And for the vertex: Ok. Now we know the vertex is (8.4,-41823.4)
anonymous
  • anonymous
yes ok i'm clear now
Mertsj
  • Mertsj
Good for you.
anonymous
  • anonymous
thank you!!!!!!!!
Mertsj
  • Mertsj
yw

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