Question

2 (a2 +ab ) + 3- ab then a=-1 ,b=-2

Answer 1

if a=-1 ,b=-2

then

2 (a2 + ab) +3-ab
=2[(-1)(2) + (-1)(-2)] + 3-(-1)(-2)
=2(-2+2)+3-(2)
=-4+4+3-2
=1