Maths Dictionary · JSS 2
Expand
Simple meaning
To remove brackets by multiplying everything inside by what is outside.
Example
3(x + 4) = 3x + 12.
See it
From the Expanding Brackets lesson. Try moving things around.
Each part's area = its side × its top. Dashed pink parts are negative.
Sides: 4(x + 3)
Parts: 4x + 12
Area = 4x + 12
Outside number4
x-number inside1
Number inside3