Question

Factorise ab(a^2+b^2-c^2)+bc(a^2+b^2-c^2)+ca(a^2+b^2-c^2)

Answer 1

[a^2+b^2-c^2]+[ab+bc+ca]

Grouping like terms in every equation(a^2+b^2-c^2)

Grouping remaining terms (ab,bc,-ca)

therefore,we get

[a^2+b^2-c^2]+[ab+bc+ca]