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anonymous

  • 5 years ago

what is the LCM of 15x,12x? I am tutoring a student who says that one simply drops the x? That can't be right

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  1. apples
    • 5 years ago
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    You can't drop the x, since you don't know what its factors compose of. The lcm is instead \[\frac{12x \cdot 15x}{gcd(12x, 15x)}\] which should make enough sense; you need to multiply 12x and 15x together to find a common denominator, then divide by the greatest common denominator of that product.

  2. radar
    • 5 years ago
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    the LCD is the smallest number that has the factors of 12x and 15x

  3. radar
    • 5 years ago
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    the factors (prime) of 12 is 2*2*3 and 15 is 5*3 so the LCD must be 2*2*3*5 or 60

  4. anonymous
    • 5 years ago
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    hello

  5. anonymous
    • 5 years ago
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    all

  6. radar
    • 5 years ago
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    I forgot to include the x !! 60x

  7. radar
    • 5 years ago
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    You can not simply drop the x!

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