Question 48: Multiply \(\begin{array}{l} \left( {{x^2}{y^3} + x{y^2} – xy + x} \right).x{y ^2} \end{array} \) we get:

\(\begin{array}{l} \left( {{x^2}{y^3} + x{y^2} – xy + x} \right).x{y^2}\\ = { x^2}{y^3}.x{y^2} + x{y^2}.x{y^2} – xy.x{y^2} + xx{y^2}\\ = { x^3}{y^5} + {x^2}{y^4} – {x^2}{y^3} + {x^2}{y^2} \end{array} \)