G S Rehill's Interactive Maths Software Series - "Building a Strong Foundation in Mathematics" from mathsteacher.com.au.

 

Year 7 Interactive Maths - Second Edition


The Distributive Law

Consider the expression a(b + c).

This expression represents the area of a rectangle of length b + c and width a.  So, this expression can be represented as:

This drawing illustrates the Distributive Law.

This can be split up into two parts as follows:

This drawing illustrates the Distributive Law.

Now, the sum of the areas of the rectangles = ab + ac.

This suggests that:

a(b + c) = ab + ac

This is called the Distributive Law.


Example 14

Expand 7(x + 8) and 8(x + 6).

Solution:

Use the Distributive Law to expand the expression.

Use the Distributive Law to expand the expression.


Example 15

Expand 5(y - 9) and 8(x - 4).

Solution:

Use the Distributive Law to expand the expression.

Use the Distributive Law to expand the expression.


Example 16

Expand and simplify 5(3 - x) + 7(x + 3) and 4(x + 3) + 2(x - 4).

Solution:

Use the Distributive Law to expand the expression and then add like terms.

Use the Distributive Law to expand the expression and then add like terms.


Key Term

Distributive Law

 

Study Another Topic in Chapter 5: Algebra

Pronumerals ] Multiplication of a Pronumeral by a Number ] Multiplication of a Term by a Number ] Expressions ] Multiplication of Pronumerals ] Multiplication of Terms ] Further Like Terms ] Division of a Term by a Number ] [ The Distributive Law ] Symbols ] Index ]

 

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