As given by the question
There are given that the expression
[tex](3x-5)(4-9x)+(2x+1)(6x^2+5)[/tex]
Now,
simplify the above-given expression
So,
[tex]\begin{gathered} (3x-5)(4-9x)+(2x+1)(6x^2+5)=\lbrack(3x)(4)-(3x)(9x)-20+45x\rbrack \\ +\lbrack12x^3+10x+6x^2+5\rbrack \\ =12x-27x^2-20+45x+12x^3+10x+6x^2+5 \end{gathered}[/tex]
Then,
[tex]12x-27x^2-20+45x+12x^3+10x+6x^2+5=12x^3-21x^2+67x-15[/tex]
The value of simplification of the given expression is shown below:
[tex]12x^3-21x^2+67x-15[/tex]
Hence, the correct option is C
