Question

c(b-a)+b(a-c)-a(b-c)​

Answer 1

$\mathfrak{\huge{\red{ANSWER}}}$

$c(b - a) + b(a - c) - a(b - c) \\ \\ = \geqslant cb - ca + ab - cb - ab + ac \\ \\ = \geqslant cutting \: all \: factors \\ \\ = \geqslant cb \: from \: - cb \\ \\ = \geqslant - ca \: from \: ac \\ \\ = \geqslant ab \: from \: - ab \\ \\ = \geqslant nothing \: left \: so \: answer \: is \\ \\ = \geqslant 0$

$\mathfrak{\huge{\red{0}}}$