How do you factor $12x² -9x+15$ ?

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Answer 1 · 2015-06-08T07:29:43

$12x^2-9x+15=3(4x^2-3x+5)$

Calculate the delta of this trinomial:
$Delta_x=3^2-4*4*5=9-80<0$
So you can't factor this trinomial in the set of Real numbers.

How do you factor 12x² -9x+1512x² -9x+15?