Question

Please solve this important​

Answer 1

Step-by-step explanation:

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Answer 2

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Note the question here , the suitable identity to be used is as follows :

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

$( \frac{7}{5} yz \: + \frac{2}{3}xy {}^{2} )( \frac{7}{5}yz - \frac{2}{3}xy {}^{2})$

Now , use the above stated identity :

$( \frac{7}{5}yz) {}^{2} - ( \frac{2}{3}xy {}^{2}) {}^{2}$

$\frac{49}{25} {y}^{2} {z}^{2} - \frac{4}{9} {x}^{2}y {}^{4}$

$\frac{441 {y}^{2} {z}^{2} - 100 {x}^{2} {y}^{4} }{225}$

After that , take y² common from antecedent

we get ,

$\frac{y {}^{2}(441 {z}^{ {}^{2}} - 100x {}^{2} )}{225}$

Here , we end up.

Hope it works !!