Answers

2016-06-25T16:04:32+08:00
  • Brainly User
2016-06-25T18:26:36+08:00
CUBE OF BINOMIAL STEPS:

1) Cube the first term
2) 3 (first term)² (second term)
3) 3 (first term) (second term)²
4) Cube the last term

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(a + b)³ = a³ + 3(a)² (b) + 3(a) (b)² + b²
             = a³ + 3a²b + 3ab² + b³

(a-b)³ = a³ - 3(a)²(b) + 3 (a) (b)² - b³
          = a³ - 3a²b + 3ab² - b³

(x+y)³ = x³ + 3 (x)²(y) + 3(x) (y)² + y³
          = x³ + 3x²y + 3xy² + y³

Please answer the last two item as practice so you'd learn.  Follow the patter and steps.
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