Question

For which values of x is the expression undefined?
x-6
x² - 16

Answer 1

x = - 4 , x = 4

Explanation:

the expression is undefined if the denominator equals zero

equate the denominator to zero and solve for x

x² - 16 = 0 ( add 16 to both sides )

x² = 16 ( take square root of both sides )

x = ±
`√(16)` = ± 4

that is the expression is undefined when x = - 4 or x = 4