Question

urgente pfvrrr
03) (x +5y)2
04) (3 + a)2
05) (3m + n)² + 2n²

Answer 1

$\boxed{\begin{array}{l}\tt03)~\sf(x+5y)^2=x^2+10xy+25y^2\\\tt 04)~\sf(3+a)^2=9+6a+a^2\\\tt04)~\sf(3m+n)^2+2n^2=9m^2+6mn+n^2+2n^2=9m^2+6mn+3n^2\end{array}}$