Answer:
6x
2
−3−7x
=6x
−7x−3
−9x+2x−3
=3x(2x−3)+1(2x−3)
=(2x−3)(3x+1).
Then, f(x)=0⟹2x−3=0 and 3x+1=0.
Therefore, 2x=3 and 3x−−1.
That is, x=
3
, x=
−1
.
