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secondary 3 | A Maths

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Hi need help with part (ii) thanks

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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