Expressions

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 result:

x =  6
y =  -1
z =  12
w =  -4

Solution:

a=−1 b=2 x=b−2⋅ a−a⋅ b=2−2⋅ (−1)−(−1)⋅ 2=6
y=a3−b2−2⋅ a⋅ b=(−1)3−22−2⋅ (−1)⋅ 2=−1
z=a2⋅ b3−a3⋅ b2=(−1)2⋅ 23−(−1)3⋅ 22=12
w=a+b+a3−b2=(−1)+2+(−1)3−22=−4

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