Question

(3a+1)^2+(3b)^2 solve the following​

Answer 1

9a^2 + 1+ 3a + 9b^2

=9a^2+9b^2+3a+1

Answer 2

(3a+1)² + (3b)²

${a + b}^{2} = {a}^{2} + 2ab + {b}^{2}$

=(3a)²+(2×3a×3b)+(3b)²

=9a²+18ab+9b²