Show that $$\((2 n-5)^{2}-13\)$$ is a multiple of 4 for all integer values of $$\(n\)$$.

E2.2.2 Use brackets and extract common factors.

E2.2.3 Expand products of algebraic expressions. (e.g. expand (x + 4)(x – 7)) (Includes products of more than two brackets, e.g. (x + 4)(x – 7)(2x + 1))

E2.2.4.1 ax+bx+kay+kby