binomial cube formula problem 3:
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Calculate the following binomial cube formula:
(- 5x – 2y)³ =
answer:
(- 5x – 2y)³ =
-a³ – 3a²b – 3ab² – b³
– 125x³ – 150x²y – 60xy² – 8y³
how to calculate the parts:
a³ = – 5x • – 5x • – 5x = – 125x³
3a²b = 3 • (- 5x • – 5x) • -2y = – 150x²y
3ab² = 3 • – 5x • (- 2y • – 2y) = – 60xy²
b³ = – 2y • – 2y • – 2y = – 8y³