Question

Express the discrete time signal ( x[n] = n², -1 < n < 3 ) as a linear combination of the orthonormal basis ( g ).
a) ( g[n] = 1/√5(n+1) )
b) ( g[n] = 1/√6(n-1) )
c) ( g[n] = 1/√7(n-2) )
d) ( g[n] = 1/√8(n+3) )