Question

Find the excluded value of the rational expression

2x + 6
4x – 8
A. -3
B. -2
C. 0
D. 2

Answer 1

The denominator must be 0, aka 4x - 8 must be 0 to get the excluded value.

\(\Large \color{MidnightBlue}{\Rightarrow 4x - 8 = 0 }\)
\(\Large \color{MidnightBlue}{\Rightarrow 4x = 8 }\)
\(\Large \color{MidnightBlue}{\Rightarrow x = 2 }\)

Excluded value of the expression is 2.