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 one year ago
Let f(x) = (x^2 + 3x – 4) and g(x) = (x + 4).
a. Find f • g and state the domain.
b. Find f/g and state the domain.
 one year ago
Let f(x) = (x^2 + 3x – 4) and g(x) = (x + 4). a. Find f • g and state the domain. b. Find f/g and state the domain.

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kirk.freedman
 one year ago
Best ResponseYou've already chosen the best response.1So I know I start by multiplying (x^2+3x4)(x+4)... I get x^3+7x^2+8x16 what now?

sparik1997
 one year ago
Best ResponseYou've already chosen the best response.1f • g=x^3+4x^2+3x^2+12x4x16=x^3+7x^2+8x16 the domain means what values can x get, here, x can be any real number. so the domain is all numbers.

kirk.freedman
 one year ago
Best ResponseYou've already chosen the best response.1How do I know it is all numbers and there isn't like one number that doesn't work? Is there a way to check that?

sparik1997
 one year ago
Best ResponseYou've already chosen the best response.1f/g=(x^2 + 3x – 4)/(x+4) as we know, the denominator can't be equal to 0, so x+4 can't be equal to 0, that means, x can be any number but 4

sparik1997
 one year ago
Best ResponseYou've already chosen the best response.1if there is a square root or a denominator, you must consider that denominator can't be 0 and the expression in the square root is >=0

kirk.freedman
 one year ago
Best ResponseYou've already chosen the best response.1Wait so what is f/g?

sparik1997
 one year ago
Best ResponseYou've already chosen the best response.1the domain of f/g is any real number but 4

kirk.freedman
 one year ago
Best ResponseYou've already chosen the best response.1Yeah, that's the domain, but it says find f/g and then it says also find the domain, I thought that that means I need two answers there?

sparik1997
 one year ago
Best ResponseYou've already chosen the best response.1f/g=(x^2 + 3x – 4)/(x+4)

kirk.freedman
 one year ago
Best ResponseYou've already chosen the best response.1wait, what would be the steps to find that the domain of f/g is all but 4?

kirk.freedman
 one year ago
Best ResponseYou've already chosen the best response.1is it like x+4>=0 then subtract 4 from both sides so you have x>=4?

kirk.freedman
 one year ago
Best ResponseYou've already chosen the best response.1dw:1356492631732:dw now what @Hero

kirk.freedman
 one year ago
Best ResponseYou've already chosen the best response.1Oh yeah, I knew that xD thanks! so it's x1?

kirk.freedman
 one year ago
Best ResponseYou've already chosen the best response.1And i'm done now?

kirk.freedman
 one year ago
Best ResponseYou've already chosen the best response.1Thanks to both of you!
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