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secondary 3 | A Maths
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Shyann
Shyann

secondary 3 chevron_right A Maths chevron_right Singapore

Hi need help with part (ii) thanks

Date Posted: 2 months ago
Views: 74
Wee Wen Shih
Wee Wen Shih
2 months ago
f(x) = 2(x + 1)(x^2 - 4x + 2) = 0
Consider x^2 - 4x + 2 = 0
Discriminant = (-4)^2 - 4(1)(2) = 8 > 0
x^2 - 4x + 2 = 0 has 2 distinct real roots

Hence f(x) = 0 has 3 real roots.

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TOH CHONG CHENG
Toh Chong Cheng's answer
8 answers (Tutor Details)
1st
Hope you understand. And highest degree of power will determine the total number of roots, which in this case is 3. The rest of the work is to determine how many are REAL roots.