9th grade algebra problem?
which one of the following set contains all values of x for which the fraction x+2 / x(squared) - 49 is undefined?
a) {7, -7}
b) {7}
c) {-2}
d) {0}
how did you get that?
which of the following is an element of the intersection of te set of interger and the set of rational numbers?
a) 0
b) 1/2
c) 0.2
d) pie
how do you know
Comments
Do you mean this: (x+2)/(x^2 -49)? It is undefined when the denominator is 0.
Lets try everything.
d) 0^2 - 49 = -49. Not 0.
c) -2^2 - 49 = -45, not 0.
b) 7^2 - 49 = 0. Is it all the values though?
a) Both -7^2 - 49 AND 7^2 - 49 = 0.
Therefore, A is the correct answer.
The first one, -2, because 0 divided by anything is undefined, it's impossible, the second one I'm not sure about its worded horribly.