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Answer:

[tex]81(a + b) {}^{2} - 64(x + y) { \\ \\ \\ }^{2} \\ = {9}^{2} {(a + b)}^{2} - {8}^{2} ( {x + y)}^{2} \\ = {(9(a + b)})^{2} - ( {8(x + y)})^{2} \\ = {(9a + 9b)}^{2} - {(8x + 8y)}^{2} \\ [/tex]

Step-by-step explanation:

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You can more Factories to this term by using

a²-b²= (a+b)(a-b)

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Answer:

tex]81(a + b) {}^{2} - 64(x + y

Step-by-step explanation:

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