Answers

2014-10-23T22:14:02+08:00
Pascal triangle   (a+b)⁴ = a⁴ + 4a³b+ 6a²b² +4a b³ + b⁴
(2x+5y)⁴ = (2x)⁴+4(2x)³5y+ 6(2x)²(5y)² + 4.2x(5y)³+ (5y)⁴
   16x⁴+160x³y+600x²y²+1000xy³+ 625y⁴
the 2nd term is  160x³y
the  4th term is 1000xy³
   
  
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