Question

What value of x is in the following expression undefined? 10 / (-8 + 2x).

A) x = 4
B) x = -4
C) x = 2
D) x = -2

Answer 1

A

Explanation:

the denominator of the expression cannot be zero as this would make the expression undefined.

Equating the denominator to zero and solving gives the value that x cannot be

- 8 + 2x = 0 ( add 8 to both sides )

2x = 8 ( divide both sides by 2 )

x = 4 ← excluded value

that is x = 4 would make the expression undefined.