anonymous
  • anonymous
Find the specified nth term in the expansion of the binomial. (Write the expansion in descending powers of x.) (x - 4y)^6, n = 3
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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amistre64
  • amistre64
1,6,15,20,15,6,1
anonymous
  • anonymous
Ok so that's from pascal's triangle right... I sort of understand this but still a little confussed
amistre64
  • amistre64
1x^6 +6x^5y15x^4y20x^3y25x^2y6xy +y yes

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anonymous
  • anonymous
Ok so when I did this I was close but I mixed up the x and y components like x goes down and y goes up...?
amistre64
  • amistre64
1x^6 +6x^5(-4y) +15x^4(-4y)^2 +20x^3(-4y)^3 +15x^2(-4y)^4 +6x(-4)^5 +(-4)y^6
amistre64
  • amistre64
yes; the x descends as the y ascends
anonymous
  • anonymous
just follow wat amistre says
amistre64
  • amistre64
the 3rd term is: 15(16) x^4 y^2 right?
amistre64
  • amistre64
lol..... unless we are heading for a cliff, then dont ;)
anonymous
  • anonymous
lol ok can you explain where you are getting the third term after I fixed my x and y's and combined terms I got 6x(-4)^5 +(-4)y^6....what did you do from there?
amistre64
  • amistre64
the 'y' component here is (-4y)
amistre64
  • amistre64
1,6,15...the coeff is gonna be 15 as a standard..
anonymous
  • anonymous
right...
amistre64
  • amistre64
x^6,5,4... y^0,1,2 15x^4 (-4y)^2
anonymous
  • anonymous
oh I see where you got that so if I simplified it it would be 240x^4y^2
amistre64
  • amistre64
yes :)
anonymous
  • anonymous
Thank you so much! This was a problem I sat here and was like what the heck am I doing wrong! lol thank you thank you thank you!
amistre64
  • amistre64
just a moment of lucidity for me :)
anonymous
  • anonymous
Ha ha brilliant! lol
anonymous
  • anonymous
ok so I have (x - 2y)^12, n = 6 1, 12, 66,220,495,792, 924,792,495,220,66,12,1 1x^12+12x^11y+66x^10y+220x^9y+495x^8y+792x^7y+924x^6y+792x^5y+495x^4y+495x^3y+220x^2y+66x^1y+12xy+1x
anonymous
  • anonymous
Idk if I did that right actually...?

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