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Facot the expression 81x^2-25 ?

User Ollb
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81x^2\text{ - 25}

Apply difference of two square


x^2-y^2\text{ = (x - y)(x + y)}


\begin{gathered} 81x^2\text{ - 25} \\ =(9x)^2-5^2 \\ \text{Apply difference of two square} \\ =\text{ (9x - 5)(9x + 5)} \end{gathered}

User Aditya Shankar
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