Question

Find the domain of each function
a. f(x)=x/x^2-9
b. g(x)=3/sqrt of x+7
c. h(x)=sqrt of 5-x

Answer 1

is the first one \(f(x)=\frac{x}{x^2-9}\) ?

Answer 2

yes

Answer 3

if so, domain is all real numbers except where the denominator is zero
set \(x^2-9=0\) and solve for \(x\)

Answer 4

why

Answer 5

for the next two, make sure that
a) \(x+7>0\) and
b) \(5-x\geq 0\)

Answer 6

oh, to answer your question, because you cannot divide by \(0\)

Answer 7

so if you write \(\frac{-3}{0}\) it is not a number

Answer 8

@satellite73 Fan me please

Answer 9

Ok, thnx for the useful info

Answer 10

yw