For exponential functions of the form f(x) =

B. f(3 + 4)

Step-by-step explanation:

f(x) = a^x

f(3) = a^3

f(4) = a^4

f(3) * f(4) = f(3) * f(4) = a^3 * a^4 = a^(3 + 4) = f(3 + 4)

f(3 + 4)

Step-by-step explanation:

Since they are exponents...,

If f(x) = a^xthen substitute as given,

; f(3) = a^3

; f(4) = a^4

Hence as the question states

f(3).f(4) = a^3 × a^4

; If the values are of the same base...,

then we add the exponents if the question is of multiplication

; a^3+4in which our new x = (3 + 4)

;Which is the one that we substitute onto the value of x in f(x)

Hence answer... f(3 + 4)