Evaluate Expressions

Evaluate

 $\left|2x-3y\right|$  for x=2 and y=3

Evaluate

 $\frac{x-2y}{\text{x + 2y}}$  for x = 4 and y = 2

Evaluate (x + 2y)(-3x - z) for x = -3, y = 2 and z = -2

What is a variable?

• A number

• A constant

• A letter

• A coefficient

How many terms are in the following expression:
 $a^2+4ab+b^2$  

• 1

• 2

• 3

• 4

 $\frac{1}{3}x^2$  

Identify the coefficient of x in

• 1

• 3

• 1/3

• 2

 $-\ \frac{3y}{4}$  

Identify the coefficient of y in

• 3/4

• 3

• 4

• -3/4

Expand $\left(x+y\right)^2$  

•  $x^2+y^2$  

•  $x^2+xy+y^2$  

•  $x^2+2xy+y^2$  

•  $xy^2$  

 $\left(z^3\right)^3$  

Expand

•  $z^6$  

•  $z^9$  

•  $z$  

•  $z^{27}$  

 $\frac{\left(yz-3\right)}{x+2z}$  for x = 0, y = -7 & z = 3

Evaluate