48.6k views
1 vote
For what values of the variables are the following expressions defined? 1/x+7

1 Answer

7 votes

Answer:

An expression f(x) is undefined when we have a zero in the denominator,

if our expression is

f(x) = 1/(x +7)

then the denominator is x + 7, and this is only zero when x = -7.

Then, we have that our expression is defined for all the real values except x = -7

we can write this set as:

D = {x ∈ R ∧ x ≠ -7}

(which says "x is a real number and x is different than negative seven")

User Auroranil
by
8.0k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories