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|3x|=9 what's the answer and the breakdown of this problem?
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|3x|=9 what's the answer and the breakdown of this problem?

User Tal Humy
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  • |3x|=9 means that 3x=-9 or 3x=9 so x=3 and x=-3
User Benjarobin
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|3x|=9\iff3x=9\ \vee\ 3x=-9\qquad\text{divide both sides by 3}\\\\x=3\ \vee\ x=-3

User Christiaan Herrewijn
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