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

Correct answer:

x =  6
y =  -1
z =  12
w =  -4

Step-by-step explanation:

a=1 b=2 x=b2 aa b=22 (1)(1) 2=6
y=a3b22 a b=(1)3222 (1) 2=1
z=a2 b3a3 b2=(1)2 23(1)3 22=12

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