Simplifying Expressions

This item is taken from IGCSE Mathematics (0580) Paper 43 of October/November 2010.


To deal with this item, let us summarize the details of the problem:
   (a) Syllabus area: Algebra
   (b) Specific topic: Simplifying Algebraic Expressions

Take note that there are terms enclosed by parentheses and a term outside each group. This suggests the use of distributive property. 

Therefore, x(x+3) + 4x(x-1) = 5x^2 - x.
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