What are the excluded values for 12aa23a10?

1 Answer
Jul 31, 2017

a=2anda=5

Explanation:

In the expression 12aa23a10 the denominator is a quadratic polynomial, that can be factored

a23a10=a2+(25)a+(5)(2)

=a2+2a5a+(5)(2)=(a5)(a+2)

Then

12aa23a10=12a(a5)(a+2)

The zeroes of the polynomial in the denominator are a=5 and a=2 which are the excluded values. These values are themselves excluded because you cannot divide by 0.