Keithhannahidn
Answered

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what do you mean by domain of a relation/function?

Sagot :

you use the value x for domain and y for range.when we say domain both x is 0      ex
x,y 
(0,5) (0,2) 
-both x is 0
The domain of a relation or function are all the values of x (elements of reals numbers).  Each x-value has a corresponding y value.

Example:

f (x) = 2x + 3         Note:  f(x) is y-value for the given x.
f (4) = 2 (4) + 3
f (4) = 8 + 3
f (4) = 11

This means that if x = 4, then y = 11

The corresponding y-values is the range (elements of real numbers)

If all domain and range are elements of real numbers, then:
Domain = {x/x is an ∈ of Real Numbers}
Domain = (-∞ , +∞)

Range = {y/y is an ∈ or Real Numbers}
Range = (-∞ , +∞)