tolong dong jawab soal fungsi ini

f(x)=(5x-3)(2x²+1)
u=5x-3,   u'=5
v=2x²+1, v'=4x
f'(x)=uv'+u'v
      =(5x-3)(4x)+(5)(2x²+1)
       =20x²-12x+10x²+5
       =30x²-12x+5 (C)