$x^{3} - 8 x^{2} + 12 x - 5 = ?$ ; $w h e n x = 1$

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Solution

$x^{3} - 8 x^{2} + 12 x - 5$ ( When $x = 1$ )
$\Rightarrow (1)^{3} - 8 (1)^{2} + 12 (1) - 5$
$\Rightarrow (1 - 8) + (12 - 5)$
$\Rightarrow - 7 + 7$
$\Rightarrow 0$
$∴ x^{3} - 8 x^{2} + 12 x - 5 = 0$ at $x = 1$

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