binomial cube formula problem 4:
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Calculate the following binomial cube formula:
(- 7x + 4y)³ = ?
answer:
(7x + 4y)³ =
a³ + 3a²b + 3ab² + b³
343x³ + 588x²y + 336xy² + 64y³
how to calculate the parts:
a³ = 7x • 7x • 7x = 343x³
3a²b = 3 • (7x • 7x) • 4y = 588x²y
3ab² = 3 • 7x • (4y • 4y) = 336xy²
b³ = 4y • 4y • 4y = 64y³