Question

9xy^2 -11xy^2

Answer 1

\(\bf 9{\color{brown}{ xy^2}} -11{\color{brown}{ xy^2}}\qquad say\quad a= {\color{brown}{ xy^2}}\qquad thus
\\ \quad \\
9{\color{brown}{ a}}-11{\color{brown}{ a}}=?\)