If the quadratic equation has equal real roots, what are the possible values of the constant ?

Answer and explanation

Correct answer: C. or

.
  1. Step 1: A quadratic equation has equal real roots if and only if its discriminant is zero: .
  2. Step 2: Substitute :
  3. Step 3: Set : or .
Answer
or .
Why not the others: or solves ; or solves ; or solves .

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