11. (RP. 3) A $90 pair of boots is on sale 25% off. How much do they cost now?
2 answers:
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Because which numbers will make the expessions undefined. We will focus on the denominator only.
Factor the terms.
Now which 2 numbers that will make these terms become 0?
12 and - 1 of course.
So these 2 numbers that will make the expressions undefined are 12 and - 1