Yee Miao Ling's answer to sun fen's Secondary 3 A Maths question.

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Yee Miao Ling
Yee Miao Ling's answer
29 answers (Tutor Details)
Assuming you get the correct factorisation in part i), this should be how it is done.
If you need answer to 3s.f. just enter square root 5 into your calculator and round to 3 s.f. :)