if 7x-5x=6 and xy=9 then the value of 343x^3-125y^3
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(7x - 5y)^3 = (7x)^3 - (5y)^3 -3(7x)(5y)[7x-5y]
6^3 = 343x^3 - 125y^3 - 3×35×yx × (6)
216 = 343x^3 - 125y^3 - 105 × 9 ×6
216 = 343x^3 - 125y^3 - 5670
216 + 5670 = 343x^3 - 125y^3 = 5886
6^3 = 343x^3 - 125y^3 - 3×35×yx × (6)
216 = 343x^3 - 125y^3 - 105 × 9 ×6
216 = 343x^3 - 125y^3 - 5670
216 + 5670 = 343x^3 - 125y^3 = 5886
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