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Three times the square of a non-zero number is equal to nine times the number

User Njtman
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2 Answers

2 votes

D:x\\eq0\\\\3x^2=9x\ \ \ |divide\ both\ sides\ by\ 3\\\\x^2=3x\ \ \ |subtract\ 3x\ from\ both\ sides\\\\x^2-3x=0\\\\x(x-3)=0\iff x=0\\otin D\ or\ x-3=0\\\\\boxed{x=3}\in D
User Jgrant
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6 votes
3 x 3^2 = 9 x 3
3 x 9 = 9 x 3
27 = 27

Your number is 3
User Kilian Obermeier
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