7. Factorize: 64x³ + 729y³
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Answer:
(4x + 9y)(16x² - 36xy + 81y²)
Step-by-step explanation:
Use:- a³ + b³ = (a + b)(a² - ab + b²)
if a^3 = 64x³ , a = 4x and
if b^3 = 729y³ , b = 9y
Therefore
: 64x³ + 729y³ = (4x + 9y)(16x² - 36xy + 81y²)