Question

For what value of x is the rational expression below equal to zero? x-1/(x-3)(x+1)
A. -3
B. -1
C. 1
D. 3

Answer 1

The answer is c. If you plug in 1 where there are x's. The numerator is 0 making the whole equation equal to 0.

Answer 2

Answer:

C. 1

Step-by-step explanation:

We have the rational expression, $\frac{(x-1)}{(x-3)(x+1)}$.

After equating the expression to 0, we get,

$\frac{(x-1)}{(x-3)(x+1)}=0$

i.e. $(x-1)=0\times [(x-3)(x+1)]$

i.e. $(x-1)=0$

i.e. x= 1

Thus, the value for which the rational expression is equal to 0 is x= 1.

Hence, option C is correct.