Problem solving

Harder factorisation

Quadratic equations

Difference of two squares

Quadratic factorising

Factorisation

Squaring a bracket

(x+2)^2
= (x+2)(x+2)
= x^2+2x+2x+4

(x+a)^2 = x^2+2ax+a^2

(x-a)^2 = x^2-2ax-a^2

(x+a)(x-a) = x^2-a^2