Expanding single brackets

#### Tier: #Foundation #Higher

Description

Multiplying terms within a bracket by the term in front. This process is the reverse of Basic factorising

e.g. $3(x+2)=3x+6$

You multiply everything inside the brackets by the term in front of the brackets. In the above case, $x$ is multiplied by 3 as is 2.

$2x(3x-4)=6x^2-8x$

Students often get caught out if there is a minus sign in front:

$-3(x-4)=-3x+12$

Especially if it's in the middle of an expression:

$2(x+3)-4(x-5)=2x+6-4x+20$

The final '+20' is missed a significant number of times!

Links

Manipulating algebraic fractions

Questions to practise

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