Answer:
A
Step-by-step explanation:
[tex]\sqrt{x^3}[/tex] = [tex]x\sqrt{x}[/tex]
[tex]\sqrt{16x^3}[/tex] = [tex]4x\sqrt{x}[/tex]
[tex]x\sqrt{x}[/tex] + [tex]4x\sqrt{x}[/tex] [tex]-3x\sqrt{x}[/tex]
= [tex]5x\sqrt{x}[/tex] [tex]-3x\sqrt{x}[/tex]
= [tex]2x\sqrt{x}[/tex]
