English, asked by raviborde50, 22 hours ago

solve it step by step​

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Answers

Answered by ISAlishaTripathy
1

Answer:

The answer is

343 {x}^{3}  - 1323 {x}^{2} y + 1701x {y}^{2}  - 729 {y}^{3}

Explanation:

 {(7x - 9y)}^{3}  \\  =  {(7x)}^{3} - 3 {(7x)}^{2}(9y) + 3(7x){(9y)}^{2}  -  {(9y)}^{3}  \\  = 343 {x}^{3}  - 27y(49 {x}^{2} ) + 21x(81 {y}^{2} ) - 729 {y}^{3}  \\  = 343 {x}^{3}  - 1323 {x}^{2} y + 1701x {y}^{2}  - 729 {y}^{3}

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