iwanttogotostanford
  • iwanttogotostanford
DESPERATE PLZ HELP
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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iwanttogotostanford
  • iwanttogotostanford
@jim_thompson5910 @pooja195 @satellite73 @zepdrix @triciaal
iwanttogotostanford
  • iwanttogotostanford
@Teddyiswatshecallsme @sleepyhead314
iwanttogotostanford
  • iwanttogotostanford
@Gir_16 @cookienano

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More answers

triciaal
  • triciaal
the x-intercept is when y = 0. W(x) = y
iwanttogotostanford
  • iwanttogotostanford
so far this is all I've got: -To find the x intercept of W(x) , set W(x) to 0 and then solve for x. The given function W(x) should be zero at whatever point it intersects with x-axis.
iwanttogotostanford
  • iwanttogotostanford
@triciaal
triciaal
  • triciaal
yes you said the same thing twice.
iwanttogotostanford
  • iwanttogotostanford
ok is that sufficient do you think for the first part of the question to be answered correctly?
iwanttogotostanford
  • iwanttogotostanford
@triciaal
triciaal
  • triciaal
you don't need to tag me if I am right here reading.
iwanttogotostanford
  • iwanttogotostanford
ok sorry
triciaal
  • triciaal
it sounds better with the 2nd sentence first.
iwanttogotostanford
  • iwanttogotostanford
ok thanks! I am stuck on how to find the second part of the question though
triciaal
  • triciaal
insert "this is the x-intercept."
triciaal
  • triciaal
for example with a function like (put your example) to construct a rough draft we would choose values of x and find the corresponding value of y . we could also determine the end value behavior of the function.
triciaal
  • triciaal
***choose both positive and negative values
iwanttogotostanford
  • iwanttogotostanford
ok so like: x=1 and then y=-2 ? How many values do i need to choose
triciaal
  • triciaal
think you should first make up your function. domain set of x-values example { -3 - 2- 1 0 1 2 3 ) range output values lowest to highest end behavior f(-x) and f(x)
triciaal
  • triciaal
after you have the graph then you can identify where it crosses the x-axis hence see where the intercepts are.
triciaal
  • triciaal
|dw:1446691331378:dw|
triciaal
  • triciaal
here is the graph for this example shows one negative root. 2 complex roots y-intercept is (0,5)
1 Attachment
iwanttogotostanford
  • iwanttogotostanford
@triciaal please come back when you can please!
misty1212
  • misty1212
HI!!
misty1212
  • misty1212
you are working too hard for sure you can make up anything you like, any cubic polynomial with some zeros how many zeros would you like, and what would you like them to be?
misty1212
  • misty1212
btw "how many zeros would you like" your choices are one, two or three you can impress them by picking 3 or whatever
iwanttogotostanford
  • iwanttogotostanford
@misty1212 ok, how do i do this part, i already completed the first part of the problem and now I have this part left, what do i have to do: how to construct a rough graph of W(x) so that the Parks Department can predict when there will be no change in the water level
misty1212
  • misty1212
what was your polynomial ?
iwanttogotostanford
  • iwanttogotostanford
I have this so far: The given function W(x) should be zero at whatever point it intersects with x-axis. To find the x intercept of W(x) , set W(x) to 0 and then solve for x. The given function W(x) should be zero at whatever point it intersects with x-axis.
misty1212
  • misty1212
here, i will construct a polynomial of degree 3 with zeros at 3, 5 and 8\[(x-3)(x-5)(x-8)=x^3-16 x^2+79 x-120\]
misty1212
  • misty1212
it will cross the x axis at 3, 5 and 8
iwanttogotostanford
  • iwanttogotostanford
ok:-)
misty1212
  • misty1212
you can make up your own, takes two seconds only looks like you are thinking too hard for this one
misty1212
  • misty1212
|dw:1446734536788:dw|
iwanttogotostanford
  • iwanttogotostanford
ok how do i make up my own? Sorry I'm just kind of lost on this last part
misty1212
  • misty1212
pick three zeros, i don't care what you say
misty1212
  • misty1212
pick any three
iwanttogotostanford
  • iwanttogotostanford
2, 4, and 8
misty1212
  • misty1212
then the factors are \(x-2,x-4\) and \(x-8\) multiply \[(x-2)(x-4)(x-8)\] to get the polynomial in standard form
misty1212
  • misty1212
i use this to make sure i don't make an algebra mistake http://www.wolframalpha.com/input/?i=%28x-2%29%28x-4%29%28x-8%29 gives the graph too
iwanttogotostanford
  • iwanttogotostanford
ok- how do i multiply those? Just FOIL or distribute
iwanttogotostanford
  • iwanttogotostanford
@misty1212
misty1212
  • misty1212
lol foil you got three to multiply, i guess you could "foil" the first two, then multiply by the third whatever you like
iwanttogotostanford
  • iwanttogotostanford
ok and then how do I say that is a part of my answer for the last part of the question?
misty1212
  • misty1212
then you can see from the graph that it crosses the x axis at 2, 4 and 8
misty1212
  • misty1212
i will leave the inglish up to you you are smart, i am sure you can write something in your own words
iwanttogotostanford
  • iwanttogotostanford
ok haha

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