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 answer:

x =  6
y =  -1
z =  12
w =  -4

Step-by-step explanation:

$$\begin{gathered} a=-1 \\ b=2 \\ x=b-2\cdot a-a\cdot b=2-2\cdot (-1)-(-1)\cdot 2=6 \end{gathered}$$

$y=a^3-b^2-2\cdot a\cdot b=(-1{)}^3-2^2-2\cdot (-1)\cdot 2=-1$

$z=a^2\cdot b^3-a^3\cdot b^2=(-1{)}^2\cdot 2^3-(-1{)}^3\cdot 2^2=12$

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

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