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If $x^3 – 4x^2 + 19 = 6 (x – 1)$, then what is the value of $x^2 + (\frac{1}{x– 4})$.
Given: Expression $x^3 – 4x^2 + 19 = 6 (x – 1)$.
To do: To the value of $x^2 + (\frac{1}{x} – 4)$.
Solution:
Let's solve this:
$x^3-4x^2+19=6(x-1)\ \ ……( i)$
So we have to find the value of $x^2+\frac{1}{( x-4)}$
From equation $( i)$, we can say,
$x^3-4x^2+19=6( x-1)$
$\Rightarrow x^2(x-4)=6x-6-19$
$\Rightarrow x^2 (x-4)=6(x-4)-1$
$\Rightarrow x^2=\frac{6( x-4)-1}{( x-4)}$ [dividing both the side by $( x-4)$]
$\Rightarrow x^2=6-\frac{1}{x-4}$
$\Rightarrow x^2+\frac{1}{( x-4)}=6$
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