Question

For what value of x is the rational expression below undefined?

Answer 1

which expression???

Answer 2

x-4/4+x

Answer 3

we know that a rational expression is undefined if the denominator is equal to zero because any thing divided by zero is equal to infinity.
now for what value of x does the denominator equal to zero???

Answer 4

4

Answer 5

no its -4
thus the value of x = -4 makes the denominator equals zero therefore making the rational expression undefine