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SingaporeAdditional MathematicsQuick questions

Quadratic Functions and Equations

Quick questions on The discriminant and nature of roots: N(A)-Level Additional Mathematics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?
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Find the discriminant of 3x2+2x−1=03x^2 + 2x - 1 = 0 and state the nature of its roots. [2 marks]
What is q2?
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The equation x2−8x+c=0x^2 - 8x + c = 0 has equal roots. Find cc. [2 marks]
What is q3?
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Show that x2+x+1=0x^2 + x + 1 = 0 has no real roots. [2 marks]

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