Question

Shew that the square numbers which are also triangular are
given by the squares of the coefficients of the powers of x in the
expansion of
and that the square numbers which are also
1/(1-6x + x²), and that the square numbers which are also
pentagonal by the coefficients of the powers of x in the expansion of
1/(1 - 10x + x²)​

Answer 1

Answer:

ok here is ur answer hope it helps