Chua Tze Ren's answer to Chen Hong's Secondary 3 A Maths Singapore question.
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This question isn't that difficult, but your working can get quite messy because there will be several sets of values so if faced with such a question in future, you need to be very careful to not make any careless miscalculations. Hope this helps!
Date Posted:
5 years ago
For the ① , isnt -（-13÷4）just for alpha plus beta? How did it became the answer for alpha²+beta², and later 13÷2 for （alpha+beta）²- 2（aplha×beta）? Same qns similiarly to ②.
For equation 1, note how the question said that the roots of the equation were alpha SQUARE and beta SQUARE. Hence, the value -(-13/4) is alpha square plus beta square and not alpha plus beta.
Don't understand part ii of your question though as there isn't any -13/2 anywhere in it.
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