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Jared Payne
Mathematics
22 November, 08:55
What graph represents f (x) = x over the domain 3
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Diya Ross
22 November, 09:22
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Ex. 1) A piecewise function is usually defined by more than one formula: a fomula for each interval.
Example 1:
f (x) = - x if x < = 2
= x if x > 2
What the above says is that if x is smaller than or equal to 2, the formula for the function is f (x) = - x and if x is greater than 2, the formula is f (x) = x. It is also important to note that the domain of function f defined above is the set of all the real numbers since f is defined everywhere for all real numbers.
Example 2:
f (x) = 2 if x > - 3
= - 5 if x < - 3
The above function is constant and equal to 2 if x is greater than - 3. function f is also constant and equal to - 5 if x is less than - 3. It can be said that function f is piecewise constant. The domain of f given above is the set of all real numbers except - 3: if x = - 3 function f is undefined.
Example 3:
Functions involving absolute value are also a good example of piecewise functions.
f (x) = | x |
Using the definition of the absolute value, function f given above can be written
f (x) = x if x > = 0
= - x if x < 0
The domain of the above function is the set of all real numbers.
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