All..1, 2, 3 solve fast
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1)(9x-4y)(9x+4y) = 81x^2+36xy-36xy-16y^2
= 81x^2-16y^2
2)-9(a^2+b^2-2ab)
=-9a^2-9b^2+10ab
3) [(a+b)^2-c^2]
= 81x^2-16y^2
2)-9(a^2+b^2-2ab)
=-9a^2-9b^2+10ab
3) [(a+b)^2-c^2]
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