To find where a function , the function can be set equal to zero. Then, the
values that satisfy the equation are the zeros of the function
, also called the roots.
This example function has the zero
Functions whose is greater than one, such as , may have more than one root.
This function has the zeros
since the function will evaluate to
if either of these values is substituted for
If a given function doesn't intercept the
-axis, there will be no solution when the function is equal to