Important expansions Assignment Help

Assignment Help: >> Binomial theorem >> Important expansions

Important expansions:

  • (1+ x)-1 = 1- x +x2 -x3 + . . . + (-1)rxr+. . .
  • (1 - x)-1 = 1+ x +x2 +x3 + . . .+ xr + . . .
  • (1+ x)-2 = 1- 2x +3x2 -4x3+ . . .+ (-1)r(r+1)xr+. . .
  • (1 - x)-2 = 1+ 2x +3x2 +4x3 + . . .+ (r+1)xr+. . .
  • (1+x)-3 = 1- 3x +6x2 -10x3 +. . .+ (-1) 1439_Important expansions.png xr+. . .
  • (1-x)-3 = 1+ 3x +6x2 +10x3 + . . .+  1937_Important expansions1.png xr+. . .
  • In general coefficient of xr in (1 - x)- n is n + r -1Cr .
  • 237_Important expansions2.png

 

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