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Rational functions are undefined at their vertical asymptotes.
I
We are given the graph of a rational function. Let's take a look at it by considering its vertical asymptote.
Since the vertical asymptote of the function lies at x= - 3, the function is undefined for x= - 3. By knowing this we can write the denominator of our rational equation.
x=- 3 ⇔ x+3=0
y= 0, x= 0
Zero Property of Multiplication
Identity Property of Addition
LHS * 3=RHS* 3
Rearrange equation
With the value of b as 0, we can eliminate option G. Although we can now conclude that the answer is option I, let's check it by finding the value of a. To do so we will use another point from the graph, ( -2, -2).
y= - 2, x= -2
Add terms
Calculate quotient
.LHS /(- 2).=.RHS /(- 2).
Rearrange equation
Great! Now, we can complete our function. f(x) = 1x+ 0/x+3 ⇒ x/x+3 Therefore, the answer is option I.