i need some help with this pleez!

f(x+6)

f(x)=3x^2-5x+3

if u could explain in steps that would be great! :)

If f(x) = 3x^2-5x+3, then
f(x+6) = 3(x+6)^2 + 5(x+6) + 3

Multiply that out and combine terms.