Find out value of expressions if a = -1, b =2:

x=b - 2a - ab
y=a3 - b2 - 2ab
z=a2 b3 - a3 b2
w=a + b + a3 - b2


x =  6
y =  -1
z =  12
w =  -4


Solution in text x =
Solution in text y =
Solution in text z =
Solution in text w =

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