just plug and chug
f(3) = 48
f(4)-f(3) = 3*4^2 ... ==> ... f(4) = 48 + 48 = 96
Now do f(5)-f(4) = 3*5^2
Suppose f(x) − f(x+1) = 3x^2 and f(3) = 48, determine the value of f(5)
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