**Example 1: 2015 P1 8ii**

*Solution*

*Examiner’s report *

**Example 2: 2015 P1 2ii**

*Examiner’s report*

*Comments*

Graphical approach will yield x> 1.732. Notice Cambridge answer is not rounded to x>1.74 to satisfy the non-rounded inequality but rounded to 3 s.f.

*Conclusion*

Considering example 1 and example 2, we conclude that **in real life applications questions, when rounding off your answer to 3 s.f, round off such that the rounded off answer still satisfies the non-rounded off inequality.**

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