anonymous
  • anonymous
Please help The following graph describes function 1, and the equation below it describes function 2: Function 1 graph of function f of x equals negative x squared plus 8 multiplied by x minus 15 Function 2 f(x) = −x2 + 2x − 15 Function ____ has the larger maximum. (Put 1 or 2 in the blank space)
Mathematics
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SOLVED
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katieb
  • katieb
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marigirl
  • marigirl
graph of function f of x equals negative x squared plus 8 multiplied by x minus 15 So is it -x^2+8*(x-15)
marigirl
  • marigirl
do you agree?
anonymous
  • anonymous
yes

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marigirl
  • marigirl
\[Funtion 1: -x ^{2}+8x-120\] \[Function 2: -x ^{2}+2x-15\] Looking at maximum values ....we could differentiate it and equal it to zero? or we could factorise it. may i know thw topic please?
anonymous
  • anonymous
quadric models
anonymous
  • anonymous
quadratic sry
marigirl
  • marigirl
in that case we can factorise it and see which function has the larger maximum (Or draw the functions)
anonymous
  • anonymous
ok
marigirl
  • marigirl
or look at y intercepts.. the first function crosses y axis at- 120 where as the second function crosses at y axis -15 .. so the first one is more 'below' than the second.
anonymous
  • anonymous
ok
anonymous
  • anonymous
I didnt really understand this topic XD im kinda stupid
anonymous
  • anonymous
@marigirl
marigirl
  • marigirl
from the question what i can sort of gather is that we are looking at the values right.. at which point is their maximum ? if your allowed to use a graphics calculator you can see the following information:
1 Attachment
marigirl
  • marigirl
so i guess we can look at the corresponding y-values and see that Function 2 has a higher y value ? I hope i am doing this correct.. is there any way to check it?
anonymous
  • anonymous
no but u were really helpful!!!!
marigirl
  • marigirl
and if we sketch both in same graph , function will sit above function 1, meaning function 2 has a larger maximum
anonymous
  • anonymous
alright thx for all the help!!!!!
marigirl
  • marigirl
cool

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