Need help with Graphing Square Root Functions.

Question

anonymous · Answer

Don't really understand how to do this lol

jdoe0001 · Answer

what's a DOMAIN?

anonymous · Answer

Set of values

jdoe0001 · Answer

what's a RANGE?

anonymous · Answer

Set of all possible output values. Domain is usually for x and Range is usually for y

jdoe0001 · Answer

so, would it be fair to say in => y=2x, if x={1,2,3} <- is the DOMAIN
                                                  and y would be {2,4,6} respectively <- is the RANGE?

anonymous · Answer

Yeah. 2 x 1 = 2, 2x2 = 4, 2x3 = 6

jdoe0001 · Answer

though rereading your question and looking at the picture you have there, I see  nothing in there saying anything about graphing them :)

phi · Answer

to do these problems, you should remember this

DO NOT TAKE ROOTS OF NEGATIVE NUMBERS.

that means in the first problem    3x+4  ≥ 0   
solve for x to find what x values (what domain) is allowed.

jdoe0001 · Answer

in the case of $
y=2\boldsymbol{\sqrt{3x+4}}-5
$, as @phi already pointed out, the only thing you'd need to keep an eye, is that the root doesn't turn negative, otherwise is an "imaginary" value

jdoe0001 · Answer

so you'd need to bear in mind --> What values can X take, that will not turn the root to a negative number? <-- if the root turns "0", that's ok, because $\sqrt{0}=0$

jdoe0001 · Answer

so, that's more or less what they're asking

jdoe0001 · Answer

the 2nd question trhere is more or less the same matter