Checkpoint: Algebraic Expressions

In an expression, a term whose value doesn't change is called a _____.

• coefficient

• constant

• variable

• like term

Identify the coefficients in  $2x^4+5y\ +\ 6$  

• 2x and 5y

• 4 and 6

• 2 and 5

• there are none

Identify the like terms 

 $3x^{2\ }+\ 7x\ +\ 2y^2\ -\ 4y\ -x^2$  

•  $3x^2,\ 7x,\ -x^2$  

•  $3x^2,\ -x^2$  

•  $3x^2,\ x^2$  

•  $3x^2,\ 2y^2$  

 $2x^{2\ }-\ 1\ +\ xy\ +\ x^{2\ }+\ 2xy\ +\ 5$  

Simplify the expression

• This expression cannot be simplified further

•  $3x^2+\ 3xy+\ 4$  

•  $4xy^2+\ 5$  

•  $3x^2+\ 3xy+6+xy$  

 $8x-3+y$  

Evaluate the expression when x=2 and y=1

• 12

• 18

• 80

• 14

 $2x^{2\ }-\ y$  

Evaluate the expression when x = 3 and y = 8

• 521

• 28

• 10

• 4

An algebraic expression is something you might...

(SELECT ALL THAT APPLY)

• simplify

• solve

• evaluate for a given value for the variable

• use to represent a quantity

Select all of the expressions that could be used to represent the perimeter

• 2x + 5

• x + 1 + (x - 1) + 4

• 2x + 4

• x + 1

Select the expressions that could be used to represent the perimeter of the algebra tiles

• 6xy + 6

• y + x + 1 + 1 + 1 + (y - 1) + x + 1 + x + 1 + 1 + 1 + x

• xy + 3y + x

• 2y + 6 + 4x

Simplify the expression 

 $4m+\ 2mn+m^2+m+3m^2$  

• This cannot be simplified further

•  $9m^4+\ m^2+m$  

•  $4m^2+5m+2mn$  

•  $9mn^2$