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alli4476

  • 3 years ago

Hey you guys I REALLY NEED HELP

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  1. alli4476
    • 3 years ago
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    what is the lcm of -14a^3b^7 and 21a^5b^2

  2. alli4476
    • 3 years ago
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    isit 7a^8b^9

  3. jim_thompson5910
    • 3 years ago
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    what's the LCM of 14 and 21

  4. alli4476
    • 3 years ago
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    42

  5. JuanitaM
    • 3 years ago
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    for the coefficent - LCM multiply the coefficient - what is the smallest number that both 14 and 21 divide evenly. So look at x^3 and x^5; Do you see that x^5 is the smallest monomial that both x^3 and x^5 divide evenly? ----- And looking at b^7 and b^2; Do you see that b^7 is the smallest?

  6. jim_thompson5910
    • 3 years ago
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    now find the LCM of a^3 and a^5

  7. alli4476
    • 3 years ago
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    wait do I divide 3 and 5

  8. jim_thompson5910
    • 3 years ago
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    you just take the larger exponent so the LCM is a^5

  9. jim_thompson5910
    • 3 years ago
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    the LCM of b^2 and b^7 is b^7

  10. jim_thompson5910
    • 3 years ago
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    all together: LCM of -14a^3b^7 and 21a^5b^2 is 42a^5b^7

  11. alli4476
    • 3 years ago
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    are you sure there is not that answer

  12. jim_thompson5910
    • 3 years ago
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    what answer choices do you have

  13. alli4476
    • 3 years ago
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    here is what I have 7a^8b^9 249a^8b^9 249a^3b^2 7a^3b^2

  14. jim_thompson5910
    • 3 years ago
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    looks like you want the GCF (and not the LCM) then

  15. jim_thompson5910
    • 3 years ago
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    I see the GCF in there, but not the LCM

  16. JuanitaM
    • 3 years ago
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    agreed with Jim :)

  17. alli4476
    • 3 years ago
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    oh yeah sorry guys

  18. JuanitaM
    • 3 years ago
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    your answer for the 7 is correct, but for GCF and exponents; you take the smaller of the exponents

  19. alli4476
    • 3 years ago
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    ok

  20. alli4476
    • 3 years ago
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    so it would be 7a^3b^2

  21. alli4476
    • 3 years ago
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    right

  22. jim_thompson5910
    • 3 years ago
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    you are correct

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