Expressions, Formulae, and Equations 1

Expressions, Formulae, and Equations 1

By Maman Firmansyah

​Learning Objectives

After learning this material, you will be able to:

• use letters to represent numbers

• use the correct order of operations in algebraic expressions

• use words or letters to represent a situation.​

• represent a situation either in words or as a formula

• change the subject of a formula.​

Subject | Subject

Some text here about the topic of discussion

Multiple Choice

Ali thinks a number, $$m$$  .

He multiply the number by two and then add 4.

• 2(m+4)

• 2m+4

• 2+4m

• 2m4

Multiple Choice

What is the value of $$p-q$$  , when $$p=2$$  and $$q=-3$$  ?

• -1

• 1

• 5

• -5

Multiple Choice

Simplify the expression:

$$3c+4c+9d-2d$$  

• 7c+7d

• 7c-7d

• 14cd

• 7c+11d

Multiple Choice

Expand the bracket:

$$2\left(3c-3\right)$$  

• 6c-2

• 6c-6

• 6c-3

• 6c

Multiple Choice

Solve this equation:

$$n-3=5$$  

• n = 2

• n = 8

• n = -2

• n = -8

​2.1 Contructing Expressions

​2.2 Using Expressions and formulae

​A formula is a mathematical rule that shows the relationship between two or more quantities (variables).

​

You can write, or derive, your own formulae to solve problems.

An example of a formula is F = ma.

​

In this formula, F is the subject of the formula. The variable F is written on its own on the left hand side of the formula.

​2.2 Using Expressions and formulae

​You may need to rearrange a formula to make a different variable of the subject.

​

In this formula, F is the subject of the formula. The variable F is written on its own on the left hand side of the formula.