Ch 1.1 Algebraic Expressions

Ch 1.1 Algebraic Expressions

What is a term

Term

A term is just a number or variable with it's sign (positive or negative).

Example: 2, -5, 6x, 3y

What is an expression?

An expression is a bunch of terms together.

Example: 2x + 3 - 3x + 7

Multiple Choice

How many terms in this expression?

$$2+3y-5-7y$$

• 2

• 3

• 4

• 5

2x, 3x, -5x

7y, 10y

Same variables and exponents

3, 7, -21, -8

Just numbers

What are "like terms"?

Match

Match the following with their like terms

• $$x^2$$

• 7

• -y

• 4x

• $$7y^2$$

-3

5x

• $$-3x^2$$

• -3

• $$-2y$$

• 5x

• $$6y^2$$

What does simplify mean?

To simplify means to combine all like terms in an expression by adding or subtracting.

Fill in the Blank

Simplify $$3x+4-7-2x$$

What does evaluate mean?

We can evaluate an expression when we are told a specific value to use in place of a variable.

It will say something like: Evaluate 3x - 2 when x = 4.

We plug 4 into the expression in place of x and work it out.

3(4) - 2 = 12 - 2 = 10

Fill in the Blank

Evaluate $$6x+4$$ when x = 3