Question

विस्तार करा: (7x - 9y)³

Answer 1

heya!!!!

your answer

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Answer 2

विस्तार सूत्र:

$( {a-b)}^{3} = {a}^{3} - {b}^{3} - 3 {a}^{2} b+ 3a {b}^{2}$

$a = 7x \\ \\ b = 9y$

$( {7x - 9y)}^{3} = {(7x)}^{3} - {(9y)}^{3} - 3 {(7x)}^{2} (9y)+ 3(7x) {(9y)}^{2} \\ \\ = 343 {x}^{3} - 729 {y}^{3} - 1323 {x}^{2} y + 1701x {y}^{2}$
विस्तार:

$( {7x - 9y)}^{3} = 343 {x}^{3} - 729 {y}^{3} - 1323 {x}^{2} y + 1701x {y}^{2}$