The expression is 
.
The excluded values are those values of x for which the denominator,
, becomes zero.
So, we need to factorize the expression.
To factorize the expression, we can use the grouping method. Write -7x as -9x+2x to create 4 terms, as follows:
.
The, factorizing (x-9), we have (x-9)(x+2).
This expression becomes 0 for x=-2, or for x=9.
Answer: {-2, 9}
The excluded values are those values of x for which the denominator,
So, we need to factorize the expression
To factorize the expression, we can use the grouping method. Write -7x as -9x+2x to create 4 terms, as follows:
The, factorizing (x-9), we have (x-9)(x+2).
This expression becomes 0 for x=-2, or for x=9.
Answer: {-2, 9}