Question 10: Simplify the following expression: \( {\left( {x – 2} \right)^2} – {\left( {2x – 1} \right)^2} + \left( {3x – 1 } \right)\left( {x – 5} \right)\) we get:

\(\begin{array}{*{20}{l}} {{{\left( {x – 2} \right)}^2} – {{\left( {2x – 1} \right)}^ 2} + \left( {3x – 1} \right)\left( {x – 5} \right)}\\ { = {x^2} – 4x + 4 – 4{x^2} + 4x – 1 + 3{x^2} – 15x – x + 5}\\ { = ({x^2} – 4{x^2} + 3{x^2}) + \left( { – 4x + 4x – 15x – x} \right) + \left( {4 – 1 + 5} \right)}\\ { = – 16x + 8} \end{array}\)