I am going to assume that there should be "a- 2" in that last term.
I am going to assume that "S" is the sum of the infinite series, which is .Find the values of such that
How did 175S become 175+ 175? You should have
if you let y= a- 2 that becomes
Multiplying on both sides by 64:
Multiplying both sides by 4- y:
so the whole problem reduces to