Question

2ab - ab2 = 108

Answer 1

ab = 10

Answer 2

2ab - ab2 = 108

<=> (200 + ab) - (10*ab +2) = 108

<=> 200 + ab - 10 * ab - 2 = 108

<=> -9 * ab =108 - 200 +2

<=> ab = -90/-9

<=>ab = 10

Answer 3

a=1

b=0 

ab=10