can illustrate a function with a diagram
The rule
is sometimes called a mapping.
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A bit more jargon
To define a function fully, we need to know the values of x that can be used.
BUT we could have drawn the sketch for any values of x.
( y is any real number greater than, or equal to, −5 )
BUT there are no y-values less than −5, . . .
domain:
Solution:
Other values are greater than zero.
So, the range is