Question

Check my answer please! Medal!
1.Find the domain of y=4sqrtx-8
I got x>8
2. Find the domain of y=sqrt2x-4
I got x>-2

Answer 1

@neer2890

Answer 2

oops.. I don't know about functions ,domains and ranges.
sorry but I am recommending @deshawn1
hope he'll help you

Answer 3

thank you!

Answer 4

you are welcome... @baybay88

Answer 5

When finding the domain of a function, the only thing you are looking for is when the equation does not exist, meaning something is wrong when you input a specific number, for square roots, you can't take the square root of a negative number, but you CAN take the square root of zero

Answer 6

So your answer for question 1 should have been\[x \ge 8\]and i'll let you answer the second one

Answer 7

Oh i see so the 2nd one would be x>=-2?

Answer 8

not -2, it should be 2, look at what happens when you plug in -2 to that\[y=\sqrt{2x-4}=\sqrt{-2(2)-4}=\sqrt{-4+-4}=\sqrt{-8}\]you can't take the square root of a negative number

Answer 9

Oh ok I understand. Thank you!