Eugene See's answer to Koh Yun Zhen's Secondary 3 A Maths question.
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The way you find D is wrong. c is (k - 3) and the coefficient of x is k, not (-3 + k).
Then we need to prove that D is more than or equal to 0 for all real values of k
Then we need to prove that D is more than or equal to 0 for all real values of k
Date Posted:
7 years ago
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