Factorise $2r-16$2r−16.
Factorise $12nt-60tr$12nt−60tr.
Factorise $4x^2-16xy+12xz$4x2−16xy+12xz.
Factorise $-12x+4xy+3xyz+20xz$−12x+4xy+3xyz+20xz.
Identities (a ± b)^2 = a^2 ± 2ab + b^2, a^2 – b^2 = (a – b) (a + b) Factorisation (simple cases only) as examples the following types a(x + y), (x ± y)^2, a^2 – b^2, (x + a).(x + b)