Question

{9x+4y}. {9x-4y} find the product​

Answer 1

HeYa❤️...

Answer:

$= (9x + 4y)(9x - 4y) \\ \\ = 81x {}^{2} - 36xy + 36xy - 16y {}^{2} \\ \\ = 81x {}^{2} - 16y {}^{2}$

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Answer 2

Answer:

(a+b).(a-b) = a square - b square

{9x+4y}. {9x-4y} = 81 x square - 16 y square

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