Simplify the expression and find its value when a=5 and b = -3, then 2(a2 + ab) +3 - ab
2(a2 + ab) + 3 - ab
= 2a2 + 2ab + 3 -ab
= 2a2 + 2ab - ab + 3
= 2a2+ ab + 3
Put a = 5 and b = -3
=2(5)2 + 5(-3) + 3
=2(25) - 15 + 3
=50 - 12
= 38