# 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:

$w=a+b+{a}^{3}-{b}^{2}=\left(-1\right)+2+\left(-1{\right)}^{3}-{2}^{2}=-4$

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