The factors of the expression are [tex]\rm(3 - 7x^2)(x - 3)[/tex]
First group the first two terms and the last two terms together respectively.
The factors of the expression are given by;
[tex]\rm= -7x^3 + 21x^2 + 3x - 9\\\\=-7x^2(x - 3) + 3(x - 3)\\\\=(3 - 7x^2)(x - 3)[/tex]
Hence, the factors of the expression are [tex]\rm \rm(3 - 7x^2)(x - 3)[/tex].
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