■simplify:
1) (2x+3y)³ + (2x-3y)³
pls tell me the answer a soon as possible!! with all the steps!!
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Answer:
24 x²y - 36xy² - 54y³
Step-by-step explanation:
a³ - b³ = (a - b)(a² + ab + b²)
(2x-3y)³ - (2x + 3y)³ = (2x - 3y - 2x - 3y) (4x² + 6xy +9y²)
= -6y (4x² + 6xy +9y²)
= -24 x²y - 36xy² - 54y³
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