gof mean g (f(x))
f(x) = 2x^3 +5x^2
g(x) = - 4x - 1
so g(f(x)) is , put x = value of f(x) in g(x)
gof(x) = - 4*(2x^3 +5x^2) - 1
gof(x) = -8x^3 - 20 x^2 - 1
for gof(0), put x = 0 in the above expression
gof(0) = - 8* 0^3 -20 0^2 - 1
gof(0) = 0 - 0 - 1
gof(0) = -1
so the answer is gof(0) = -1
