Question

x^2 - 18x + 81 factorise into perfect square

Answer 1

$\huge {\boxed {\mathfrak\pink {\fcolorbox {red}{blue}{AnSwEr}}}}$

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$= {x}^{2} - 18x + 81 \\ = ( {x})^{2} - 2.x.9 + ({9})^{2} \\ = ({ x- 9})^{2}$

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