Question

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Answer 1

Excluded value is the value that, in this case, will make the fraction as undefined.

Answer 2

What number makes the denominator 0?

Answer 3

9x-45 = 0 if x = ????

Answer 4

And if x is 5, 9x-45 is 0 and the fraction is 4/0. That is ILLEGAL to have a denominator of 0 so we must KICK OUT 5. That is, we must EXCLUDE 5.

Answer 5

Good.