Question

50a3 + 10a2

Answer 1

$50a^3+10a^2\\\\50a^3=10\cdot5\cdot a^2\cdot a=10a^2\cdot5a\\\\50a^3+10a^2=10a^2\cdot5a+10a^2\cdot1=\huge\boxed{10a^2(5a+1)}\to\boxed{A}$

Answer 2

$50a^3+10a^2=10a^2(5a+1)\Rightarrow A$