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 2 years 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.
 2 years 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
 2 years 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
 2 years 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
 2 years 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
 2 years 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
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.1Wait so what is f/g?

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

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

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

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

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

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