Which rational expression is undefined when a=1

is undefined at a = 1

Step-by-step explanation:

Required

Which is undefined at a = 1

An expression is undefined when its denonimator equals 0.

So, we have to test the denominator of each.

(A): 7a + 7

This gives:

(B): 5a - 10

This gives:

(C) -a² + 1

This gives

(D) 3a²

This gives:

Notice that only (C) equals 0.

Hence:

is undefined at a = 1

x=6 and x=3

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table 3 represents a direct variation function. : )