Eric Nicholas K's answer to AX's Secondary 4 A Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
This is for checking and it’s also to show you that the roots must come in conjugate pairs. If the roots do not come in conjugate pairs, some of the coefficients a, b and c in the quadratic equation ax2 + bx + c = 0 will not be an integer.