Find $f^{\text{'}}(x)$ and simplify. $f(x)=3x^5(x^4-2)$ Which of the following shows the correct application of the product rule? A$.(3x^5)(4x^3)+(x^4-2)(15x^4)$ B$.(3x^5)(15x^4)+(x^4-2)(4x^3)$ C$.(4x^3)(15x^4)$ D$.(3x^5)(4x^3)-(x^4-2)(15x^4)$ Find $f^{\text{'}}(x)$ and find the equation of the line tangent to the graph of $f$ at $x=2.f(x)=\frac{x-3}{2x-9}{f}^{\text{'}}(x)=3$ The equation of the line tangent to the graph of $f$ at $x=2$ is $y=$