Answer
$(6a-5)(2a-3)$
Work Step by Step
For the polynomial
$$
12a^2 -28a +15
$$
we check the factors of $ac=12(15)=180$. The only factors that can give the right middle term are $-18$ and $-10$, as follows
$$
12a^2 -28a +15=(6a-5)(2a-3)
.$$
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