anonymous
  • anonymous
Hey you guys I REALLY NEED HELP
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anonymous
  • anonymous
what is the lcm of -14a^3b^7 and 21a^5b^2
anonymous
  • anonymous
isit 7a^8b^9
jim_thompson5910
  • jim_thompson5910
what's the LCM of 14 and 21

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anonymous
  • anonymous
42
anonymous
  • anonymous
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?
jim_thompson5910
  • jim_thompson5910
now find the LCM of a^3 and a^5
anonymous
  • anonymous
wait do I divide 3 and 5
jim_thompson5910
  • jim_thompson5910
you just take the larger exponent so the LCM is a^5
jim_thompson5910
  • jim_thompson5910
the LCM of b^2 and b^7 is b^7
jim_thompson5910
  • jim_thompson5910
all together: LCM of -14a^3b^7 and 21a^5b^2 is 42a^5b^7
anonymous
  • anonymous
are you sure there is not that answer
jim_thompson5910
  • jim_thompson5910
what answer choices do you have
anonymous
  • anonymous
here is what I have 7a^8b^9 249a^8b^9 249a^3b^2 7a^3b^2
jim_thompson5910
  • jim_thompson5910
looks like you want the GCF (and not the LCM) then
jim_thompson5910
  • jim_thompson5910
I see the GCF in there, but not the LCM
anonymous
  • anonymous
agreed with Jim :)
anonymous
  • anonymous
oh yeah sorry guys
anonymous
  • anonymous
your answer for the 7 is correct, but for GCF and exponents; you take the smaller of the exponents
anonymous
  • anonymous
ok
anonymous
  • anonymous
so it would be 7a^3b^2
anonymous
  • anonymous
right
jim_thompson5910
  • jim_thompson5910
you are correct

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