How do you evaluate function notation?

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How do you evaluate function notation?

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Answer 1 · 2015-02-01T23:12:11

In fuction notation, you have a variable (often the function $f$ ) which values depends on those of another variable (often the indipendent variable $x$ ).

When we write something like $f(x)=x^2-3x+2$ , we mean that for every number $x$ , we must behave in the same way to evaluate $f$ : in this case, we must sum the square of that number, then subtract its triple, and then add 2.

Evaluating a function simply means to substitute the exact value in the generic expression of the function. In my example, if you want to calculate $f(5)$ , you simply need to replace every $x$ with a "5", and so

$x^2-3x+2 \rightarrow (2)^2-3\cdot 2 +2 = 4-6+2=0$

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How do you evaluate function notation?

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