anonymous
  • anonymous
If f(x) = x^3/2, what is (f.f)(-4)?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
is (f.f), f times f or f of f?
anonymous
  • anonymous
f of f
anonymous
  • anonymous
(f of f)(x)= (x^3/2)^3/2 sub x=-4 (f of f)(-4)=-16384

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anonymous
  • anonymous
if f(x)= { (-7,1),(-5,8} and g= { (-6,4), (-5,3)} how to find (f+g)?
anonymous
  • anonymous
Actually there is more numbers for f(x) and g(x)
anonymous
  • anonymous
f(x)= { (-7,1),(-5,8),(3,11),(5,-1) and g(x) {(-6,4),(-5,3),(-1,7),(5,5)}
anonymous
  • anonymous
I need example to slove this question. Do u know how?
anonymous
  • anonymous
just add the y values for the matching x values and keep the rest (assuming f and g are sets) so (f+g)={(-7,1),(-6,4),(-5,11),(-1,7),(3,11),(5,4)}
anonymous
  • anonymous
sorry I don't get it.
anonymous
  • anonymous
so f contains (-5,8) and g also contains (-5,3), since x=-5 appears in both, f+g for that point equals (-5,8+3)=(-5,11)
anonymous
  • anonymous
thx i got it
anonymous
  • anonymous
you either keep all the rest of the points that don't have the same x values or don't keep them at all depending on the behaviour of the function which is not defined in the question
anonymous
  • anonymous
i gonna solve other question and i will add another question. Thank for your help
anonymous
  • anonymous
no problem
anonymous
  • anonymous
f(x)= /3x/-10 and g(x)=2^3, what is (g.f)(-2)?
anonymous
  • anonymous
i have confuse about /3x/ ?
anonymous
  • anonymous
|x| means what ever value in |x| is positive example |-2|=2 i think you typed g(x) wrong since there is no variable
anonymous
  • anonymous
| | means absolute value
anonymous
  • anonymous
|3x| means absolute value of 3x
anonymous
  • anonymous
g(x)=2x^3
anonymous
  • anonymous
f(-2)=|3(-2)|-10=-4 (g of f)(-4)=2f(-2)^3=-128
anonymous
  • anonymous
Thx

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