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Factor the expression 16x^2-100y^2?

User Arcymag
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\begin{gathered} 16x^2-100y^2 \\ 4\cdot\: 4x^2+25\cdot\: 4y^2 \\ 4\mleft(4x^2-25y^2\mright) \\ 4\mleft(2x+5y\mright)\mleft(2x-5y\mright) \end{gathered}

User Moishe Lettvin
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