The algebraic expressions below are written in a factorised form. Expand them to find the products: $\backslash$table$[[$Algebraic expression,Products$],[3a(5-2a),],[(a-2)(a+7),],[(a+5{)}^2,],[(a-2)(a+2),]]1\mathrm{.}3$ What can you deduce from question $1\mathrm{.}2$ above about the relationship between algebraic expressions and their products: