anonymous
  • anonymous
What is the domain of (f*g) (x)=45x^2+19x-42? Can someone please help me? I can not, for the life of me, get this. I need it explained to me in a way I won't forget.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Haseeb96
  • Haseeb96
What do u think, what would be the domain for this ?
anonymous
  • anonymous
I think it's completely wrong...but I think it is...(.77, infinity) , and (1.2, infinity)
welshfella
  • welshfella
I assume you know what a domain is?

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anonymous
  • anonymous
But like I said...I'm pretty sure it is completely wrong...
anonymous
  • anonymous
Yes...domain is the X value and it goes from left to right
welshfella
  • welshfella
right This function is a parabola which opens upwards and looks a bit like |dw:1442166537213:dw|
welshfella
  • welshfella
excuse the rough drawing but it should give you an idea what the domain is.
anonymous
  • anonymous
It's OK. I understand what you were trying to show me. And I know that part. :)
anonymous
  • anonymous
I need to put the domain in a form like this: |dw:1442166761514:dw| but I don't know how to...
welshfella
  • welshfella
well the domain is all real numbers and you can write it as (-infinity, + infinity)
anonymous
  • anonymous
Really? I don't need to include any numbers? Wow...I was wrong
welshfella
  • welshfella
no its all reals think about it you can any number you like into the function and it will give you a value
welshfella
  • welshfella
-10,000,000 , 0 or 555,000,000,000
anonymous
  • anonymous
Oh...ok. That makes since.
welshfella
  • welshfella
yw
anonymous
  • anonymous
:)
amistre64
  • amistre64
the domain depends on the domains of f and g seperately, not combined.
anonymous
  • anonymous
well the original term is f(x)=4x+9 and g(x)=7x-3
amistre64
  • amistre64
spose for instance f = (x-3)(x-2)(x-1) g = 1/(x-1) (f*g) = (x-3)(x-2) .. but the domain is still restricted by g
amistre64
  • amistre64
then there is no issue concerning f*g
skullpatrol
  • skullpatrol
Use FOIL
anonymous
  • anonymous
45x^2+19x-42?
skullpatrol
  • skullpatrol
yup :-)
anonymous
  • anonymous
ok.
amistre64
  • amistre64
f can use all real values as inputs g can use all real values as inputs so the domain of (f*g) in this case has no restrictions to it ...
anonymous
  • anonymous
Ok...
skullpatrol
  • skullpatrol
What exactly is the question asking for?
anonymous
  • anonymous
Well I took so long to answer the other question that it gave me another question like it...
skullpatrol
  • skullpatrol
Is this a program?
anonymous
  • anonymous
Yes...it's mymathlab
skullpatrol
  • skullpatrol
What grade?
anonymous
  • anonymous
It's college- freshman
skullpatrol
  • skullpatrol
Post the question please.
welshfella
  • welshfella
oh sorry - i misread the question
anonymous
  • anonymous
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anonymous
  • anonymous
It's ok
anonymous
  • anonymous
Thank you guys/girls!
skullpatrol
  • skullpatrol
I can barely read that, which part do you need help with?
anonymous
  • anonymous
I got it...thank you guys. Sorry to trouble you guys. :)

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