from the formula:
(a + b)³ = a³ + 3a²b + 3ab² + b³
from the given:
(3x - 4y)³
where
a = 3x
b = -4y
substitute from the formula
(3x - 4y)³ = (3x)³ + 3(3x)²(-4y) + 3(3x)(-4y)² + (-4y)³
= 27x³ - 108x²y + 144xy² - 64y³
Answer:
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Answers & Comments
from the formula:
(a + b)³ = a³ + 3a²b + 3ab² + b³
from the given:
(3x - 4y)³
where
a = 3x
b = -4y
substitute from the formula
(a + b)³ = a³ + 3a²b + 3ab² + b³
(3x - 4y)³ = (3x)³ + 3(3x)²(-4y) + 3(3x)(-4y)² + (-4y)³
= 27x³ - 108x²y + 144xy² - 64y³
Answer: