Question

What are the excluded values for the rational expression `(5d+15)/(d^2-d-12)`?

Answer 1

`d!= -3 and d!=4`

Explanation:

the excluded values are those which will make the denominator equal to `0`

Factorise to find the factors

`(5(d+3))/((d-4)(d+3))`

`d!= -3 and d!=4`