greeneyes<3 3 years ago What is the domain & range of y=2 sqrt. x ?

1. alexwee123

domain and range is same as the square root function this function is only vertically stretched by a factor of two so therefore the domain and range is not affected :)

2. greeneyes<3

:( my answer was D: all real #s R: all real #s But I think that is wrong...

3. alexwee123

ya it is because x cannot be negative, you can't square root a negative unless you want imaginary :/

4. alexwee123

so because the values of x cannot be negative then the y values cannot be negative either so that leaves you with a domain of [0,infinity) and a range of [0,infinity)

5. alexwee123

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6. greeneyes<3

D: x >\= 0 r: y >\= 0 ? I'm still confused. :/

7. alexwee123

well i told you that the values of x cannot be negative because you cannot square root a negatives so all values of x must be greater than or equal to zero and because y is the output of the x values y must also be greater than or equal to 0

8. greeneyes<3

Kay thanks :) I'm sorry but I'm just so awful at math...

9. alexwee123

np:)