Question

Please Answer Please.​

Answer 1

Answer:

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Answer 2

Answer:

3x - 4y = 5

Cubing both sides,

(3x - 4y)³ = 5³

Applying the formula,(a - b)³ = a³ - b³ - 3ab(a - b)

(3x)³ - (4y)³ - 3 × 3x × 4y × (3x − 4y) = 125

(3x)³ - (4y)³ - 36 × xy × (3x - 4y) = 125

Substituting,3x - 4y = 5 ; xy = 3

27x³ - 64y³ - 36 × 3 × 5 = 125

27x³ - 64y³ = 125 + 540 = 665

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