Question

(3a^2+1)^2 ; (a^2+1)^2 ; (2x^2+3n^2)^2 ; (x^2+y^2)^2

Answer 1

(3a²+1)² =9a⁴+6a²+1;
(a²+1)² =a⁴+2a²+1 ;
(2x²+3n²)²=4x⁴+12x²n²+9n⁴ ;
 (x²+y²)²=x⁴+2x²y²+y⁴