anonymous
  • anonymous
Find the 7th term of (x^2 + 3y)^9
Precalculus
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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amistre64
  • amistre64
looks like a pascal
amistre64
  • amistre64
given: \[(p+q)^n\] we can work out the middle stuff as:\[p^{n-c}q^c\] the coeeficient is a little tricker unless you know about combinatorics
amistre64
  • amistre64
and c is the "term" value :)

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amistre64
  • amistre64
n choose c is what i think i recall for the coeff; or else draw up the pascal triangle
shubhamsrg
  • shubhamsrg
|dw:1358788894374:dw| This is the working formula.
amistre64
  • amistre64
that looks about right, but if i remember it correctly: the first term starts at 9 and drops down till it hits the 7th term
shubhamsrg
  • shubhamsrg
Didn't get you ?
shubhamsrg
  • shubhamsrg
The first term's coefficient is 1 , when r=0,
amistre64
  • amistre64
(a+b)^9 a^9 a^8 a^7 a^6 a^5 a^4 a^3 ^^^ b^0 b^1 b^2 .... b^6 ^^^ these always get turned around in my head
anonymous
  • anonymous
ok thanks
amistre64
  • amistre64
good luck ;)

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