If x3 - 4x2 + 19 = 6(x-1) find \(\left[ {x}^{2} + \frac{1}{x-4}\right]\)
Answer & explanation
Correct answer: option 3
x3 - 4x2 + 19 = 6(x-1)
x2 (x -4) + 19 = 6(x-1)
Divide by (x-4)
⇒ x2 + \(\frac{19}{x-4}\) = \(\frac{6(x-1)}{x-4}\)
⇒ x2 + \(\frac{1}{x-4}\) + \(\frac{18}{x-4}\) = \(\frac{6(x-1)}{x-4}\)
⇒ x2 + \(\frac{1}{x-4}\) = \(\frac{6(x-1)}{x-4}\) - \(\frac{18}{x-4}\)
⇒ \(\left(x^2 + \frac{1}{x-4}\right)\) = \(\frac{6x-6-18}{x-4}\) = \(\frac{6(x-4)}{(x-4)}\)
⇒ \(\left(x^2 + \frac{1}{x-4}\right)\) = 6