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secondary 3 | A Maths
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sun fen
Sun Fen

secondary 3 chevron_right A Maths

solving part (ii)

Date Posted: 5 years ago
Views: 555
Samuel Seah Rui Yi
Samuel Seah Rui Yi
5 years ago
Part 1 factorises to (x-2)(x+2)(x^2 +2x+4)(x^2 -2x +4).
Part 2, look at RHS. It is of the form (a^2-b^2).
RHS factorises to: (x^2 +2x+4)(x^2 -2x +4). Notice how this is same with 2 of the 4 factors in part 1. Cancel them out. You are left to solve this simple one: (x-2)(x+2)=1

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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. :)