Severity: Warning

Message: count(): Parameter must be an array or an object that implements Countable

Filename: controllers/calculator.php

Line Number: 37

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Domain is the set of values of ‘x’ for which the function f(x) exists!

If x= 0 f(0) = 2(0) + 1 f(0)= 1

Now let ‘x’ be any negative number x=-3 then f(-3)= -5

‘x’ is valid for any negative number.

Similarly let ‘x’ be any positive number x =1 then f(1)=3

’x’ is valid for any positive number as well.

Range is the set of output values of the function f(x).

In the above example, for the given function f(x) = 2x + 1,

Now for any real number as ‘x’, the output ‘y’ value is also a Real number.