**Question**

**Solution**

**Comment**

*x*+

*kx*

^{2})

^{2}= 3(

*x*

^{2}+ 2

*kx*

^{3}+

*k*

^{2}

*x*

^{4}), but since we do not need the

*x*

^{3}and

*x*

^{4}terms, we omit them and just write “3(

*x*

^{2}+ ... )”.

H12* Think of a related problem

H13* Use Equation / write a
Mathematical Sentence

**Suitable Levels**

* revision for GCE ‘A’ Level H2 Mathematics

* AP Calculus

* other syllabuses infinite binomial series

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