Suppose f(x) − f(x+1) = 3x^2 and f(3) = 48, determine the value of f(5)

Question

help please! show steps please !

Answer 1

f(3) = 48

f(3)-f(4) = 3*3^2
f(4) = 21

f(4)-f(5) = 3*4^2
f(5) = -27