Question

plz help me solve the twelfth problem

Answer 1

Answer:

540

Step-by-step explanation:

(3x-4y)^3=27x^3 -64y^3 -3(3x)(4y)(3x-4y)

             =27x^3 -64y^3 -36(3)(5)                 (as xy=3 and 3x-4y=5 is given)

             =27x^3 -64y^3 -180(3)

             =27x^3 -64y^3 -540

             =27x^3 -64y^3 =540.

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