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secondary 4 | A Maths
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Jinnyeol
Jinnyeol

secondary 4 chevron_right A Maths chevron_right Singapore

I have never come across question asking for alpha minus beta,, can anyone help me with this question, thank you!!!

Date Posted: 5 days ago
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Eric Nicholas K
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Jinnyeol
Jinnyeol
5 days ago
OHHHH didnt think of solving it this way! Thank you so much for your help!! :))
J
J
5 days ago
Alternative way is to use the quadratic formula.

x = (-(-4) ± √((-4)² - 4(1)(2)) ) / 2(1)

x = ½ ± ½√8

one root is ½ + ½√8, the other ½ - ½√8

Since α < β, then the difference is negative
= ½ - ½√8 - (½ + ½√8)
= - √8

(This also tells you that α = ½ - ½√8, β = ½ + ½√8)