Question

3 Сократите дробь
$\frac{ {x }^{2} - 9}{ {x}^{2} - 4x + 3}$
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Answer 1

$\displaystyle\bf\\\frac{x^{2}-9 }{x^{2} -4x+3} =\frac{(x-3)\cdot(x+3)}{(x-3)\cdot(x-1)} =\frac{x+3}{x-1}$