Please help me solve a radical problem

Please Use the distributive property to help simplify the following, thank you
-4 sqrt(36 x) + 5 sqrt(16 x) + 4 sqrt(36 x)

-4 sqrt(36 x) + 5 sqrt(16 x) + 4 sqrt(36 x)
= 5 sqrt(16 x)
= 20 sqrt(x)

-4√(36x) + 5√(16x) + 4√(36x) = -24√x + 20√x + 24√x
= 20√x