SAT Subject Test Mathematics Level 1

f(x)    =   x^2

When you apply the function to some particular number, such as −5, you write
it this way:

f(−5)

And to find the value of f(−5), you plug x = −5 into the definition:

SUBSTITUTION

The most straightforward functions questions you’ll encounter on the Math 1
test are questions like Example 1 that ask you simply to apply a function to
some number or expression.

FUNCTIONS: DOMAIN AND RANGE

A   function    is  a   set of  ordered pairs   (x, y)  such    that    for each    value   of  x

there   is  one and only    one value   of  y.

The set of  all allowable   x   values  is  called  the domain. Note    that,

according   to  the SAT subject test    directions, the domain  of  any