Question

$p = a {}^{2} - b {}^{2} + 2ab \: q = a { }^{2} + b {}^{2} - 6ab \: \: r = b {}^{2} + b \: \: \: s = a {}^{2} - 4ab \: \: t = - 2a {}^{2} + b {}^{2} - ab + b \: find \: p + q + r + s -$
Plz Plz answer to this question ​

Answer 1

2ab

i think.........