Question

22. Sum the series
x (x + y) + x2 (x2 + y2) + x3 (x3 + + y3) + ... to n terms.​

Answer 1

Answer:

[math]S_n = x(x+y) + x^2(x^2+y^2) + … + x^n(x^n + y^n)[/math] [math]= (x^2 + xy) + (x^4 + ...