If a(x) is 3x+1 and b(x)is x-4 what is the domain of (b•a)(x)

it's both, now can you answer my most recent question?

hello,

as we don't know if g(x) is continue,

answer b

f(x)=2x²-8x+1=2(x²-4x+4)+1-8=2(x-2)²-7

vertex is (2,-7) ( a minimum since coefficient of x² is > 0)