Week 4 Algebra Revision

Variables

100

Identify the variable in 5x + 3

x

200

Write an expression for 'a number plus 8'

x + 8

300

Write an expression for '5 less than a number'

x - 5

400

Write an expression for '3 times a number'

3x

500

Write an expression for 'a number divided by 4'

x/4

Substitution

100

Evaluate x + 3 when x = 2

5

200

Evaluate 4x when x = 3

12

300

Evaluate 2x + 5 when x = 4

13

400

Evaluate 3x − 2 when x = 6

16

500

Evaluate x2 + 2x when x = 3

15

Creating Expressions

100

Write an expression for '7 less than a number'

x − 7

200

Write an expression for 'twice a number plus 4'

2x + 4

300

Write an expression for 'a number divided by 5, then add 2'

x/5 + 2

400

Write an expression for '3 times a number minus 6'

3x − 6

500

Write an expression for 'the square of a number plus 1

x^2 + 1

Collecting Like Terms

100

Simplify 2x + 3x

5x

200

Simplify 7x − 4x

3x

300

Simplify 3x + 2y + 5x − y

8x + y

400

Simplify 6a − 2b + 4a + 3b

10a + b

500

3x^2+5x−2x^2+4x

x^2+9x

Expanding Expressions

100

Expand 3(x + 2)

3x + 6

200

Expand 2(x + 5)

2x + 10

300

Expand 4(x − 3)

4x − 12

400

Expand 5(2x + 1)

10x + 5

500

Expand and Simplify 3(x + 4) + 2x

5x + 12