Question

factorise. (3x-5y)^3​

Answer 1

Answer:

27x³ - 125y³ - 135x²y + 225xy²

Step-by-step explanation:

using the identity (a + b )³ = a³ + b³ +3ab ( a + b )

here , a = 3x and b = -5y

(3x-5y)³ = (3x)³ + (-5y)³ + 3 * 3x * -5y ( 3x - 5y)

             = 27x³ - 125y³ - 45xy ( 3x - 5y)

             = 27x³ - 125y³ - 135x²y + 225xy²

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