Asked by O.
How would you find the domain and range of x=2^y?
Answers
Answered by
Graham
When y = 0 then x = 1.
As y rises towards positive infinity, x rises towards positive infinity.
As y falls towards negative infinity, x falls towards 0.
There is no real value of y corresponding to any negative value of x.
-∞ ≤ y ≤ +∞
0 ≤ x ≤ +∞
As y rises towards positive infinity, x rises towards positive infinity.
As y falls towards negative infinity, x falls towards 0.
There is no real value of y corresponding to any negative value of x.
-∞ ≤ y ≤ +∞
0 ≤ x ≤ +∞
Answered by
Reiny
your domain should have been
0 < x ≤ ∞
x can never become zero
0 < x ≤ ∞
x can never become zero
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