Question

What are the identities for factorisation of quadratic equations?

Answer 1

${a}^{2} + 2ab \: + {b}^{2}$
${a}^{2} - 2ab \: + {b}^{2}$
${a}^{2} - {b}^{2}$

Answer 2

Middle term splitting method, completing the square and discriminate method