**Question**

**Introduction**

Here is
another question involving surds. As we
know, surds
are literally absurd,
because they are irrational. How to we do this one?

**Strategy**

**Solution**

**Remark**

Reflect:
What did you learn from solving this question?

For another
example of using the difference of squares formula, please look at this article.

H04. Look for pattern(s)

H09. Restate the problem in
another way

H10. Simplify the problem

H11. Solve part of the problem

**Suitable Levels**

*****GCE ‘O’ Level Additional Mathematics (indices / surds)

* challenge
for GCE ‘O’ Level “Elementary”
Mathematics (indices)

* revision for IB Mathematics HL / SL

* other syllabuses that involve indices and/or surds* any precocious or independent learner who is interested

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