[tex]\text{Use FOIL method}\ (a+b)(c+d)=ac+ad+bc+bd.\\\\(6r-1)(-8r-3)=(6r)(-8r)+(6r)(-3)+(-1)(-8r)+(-1)(-3)\\\\=-48r^2-18r+8r+3=\boxed{-48r^2-10r+3}[/tex]
Answer: A
Step-by-step explanation:
