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Use the difference of squares identity to write this polynomial in factored form 9x²-49​

User Voncox
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\bf 9x^2-49\implies 3^2x^2-7^2\implies \stackrel{\stackrel{\textit{difference of}}{\textit{squares}}}{(3x)^2-7^2}\implies (3x-7)(3x+7)

User Slashmili
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