By Leibnitz product rule,
\( f'(x)=(5x^3+3x-1)\dfrac{d}{dx}(x-1)\)
\( +(x-1)\dfrac{d}{dx}(5x^3+3x-1)\)
\((5x^3+3x-1)(1)+(x-1)(5.3x^2+3-0)\)
\((5x^3+3x-1)(1)+(x-1)(15x^2+3)\)
\(5x^3+3x-1+15x^3+3x-15x^2-3\)
\( 20x^3-15x^2+6x-4\)
Answered by Pragya Singh | 1 year ago