Find the value of this integral
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The integrand can be rewritten as
6 x 2 − 5 x + 1 6 x 2 − 5 x + 1 + 4 x − 2 = 1 + ( 2 x − 1 ) ( 3 x − 1 ) 2 ( 2 x − 1 ) = 1 + 3 x − 1 2
for x = 2 1 . The point of discontinuity ( 2 1 , 5 ) does not affect the integral, but what is of concern is when 3 x − 1 = 0 , as this leads to the vertical asymptote x = 3 1 . So splitting the integral into two improper integrals, one from 0 to 3 1 and the other from 3 1 to 1 , we end up needing to evaluate
( x + 3 2 ln ∣ 3 x − 1 ∣ ) 0 3 1 − + ( x + 3 2 ln ∣ 3 x − 1 ∣ ) 3 1 + 1 =
3 1 + 3 2 x → 3 1 − lim ln ( 1 − 3 x ) + 1 + 3 2 ln ( 2 ) − 3 1 − 3 2 x → 3 1 + lim ln ( 3 x − 1 ) =
1 + 3 2 ln ( 2 ) + 3 2 ( x → 3 1 − lim ln ( 1 − 3 x ) − x → 3 1 + lim ln ( 3 x − 1 ) ) .
Now the bracketed pair of limits are of the indeterminate form − ∞ − ( − ∞ ) ⟹ ∞ − ∞ , and so the integral cannot be evaluated, i.e., it is d i v e r g e n t .