$6 x^{2}+17 x+5=?$
(a) (2x + 1)(3x + 5)(b) (2x + 5)(3x + 1)(c) (6x + 5)(x + 1)(d) none of these
(b) (2x + 5)(3x + 1)
$6 x^{2}+17 x+5=6 x^{2}+15 x+2 x+5$
$=3 x(2 x+5)+1(2 x+5)$
$=(2 x+5)(3 x+1)$
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