Question

Answer for 14 and 15 only

Answer 1

$\bf 14)\\\\ (x-3y)^2\implies \stackrel{5}{x^2}-6\stackrel{11}{xy}+\stackrel{7}{y^2}\implies 5-66+7\\\\ -------------------------------\\\\ 15)\\\\ (x+n)(x+1)=x^2+x+nx+n\implies x^2+(x+nx)+n \\\\\\ \stackrel{x^2}{x^2}~+~\stackrel{m}{(1+n)}\stackrel{x}{x}~+~\stackrel{5}{n}\qquad \begin{cases} n=5\\ m=1+n\\ \qquad 6 \end{cases}$