A6a
Practice - Undefined Ezpressions
TRY TO ANSWER IN TWO AND A HALF MINUTES.
QUESTIONS
QUESTIONS
1. For what values of x is the expression (x + 2)/(x - 3) undefined?
2. For what values of x is the expression (x + 2)/(14x³ + 3x) undefined?
3. For what values of x is the expression (-2 + x)/((x(x+2)) undefined?
ANSWERS
1. For only one value, x = 3. In that case (x - 3) is zero.
2. For x = 0.
3. Looking only at the denominator, you can see that the first part is zero when x = 0, and that the second part is zero when x = -2.