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![or:\\\\20x^2-45y^2=5\cdot4x^2-5\cdot9y^2=5(4x^2-9y^2)=5[(2x)^2-(3y)^2]\\\\=5(2x-3y)(2x+3y)](/tpl/images/0064/1298/74893.png)
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Factor completely: a) 64x²-49y² b) 20x²-45y²...
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