Question

write a rational expression for which 6 and 3 are excluded values

Answer 1

the expression\[\frac{1}{(x-n)(x-m)}\]
is undefined for \(x=n,m\)
because if we attempted to substitute \(x=n,m\) into the expression
it would yield a fraction where the denominator is zero.

fractions with zero in the denominator dont make mathematical sense, because they cannot be evaluated.

Hence \(x=n,m\) are not allowed, these are values of \(x\) are excluded for the domain