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Multiple choice

Choose the quadratic equation with real roots.

  1. x 2 3 + x 4 − 3 = 0

  2. x 2 4 + 16 = 0

  3. (x + 4)2 + 20 = 0

  4. 7x2 + 1 = 0

  5. 4x2 - 3x + 2 = 0

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Option A: x^2/3 + x/4 - 3 = 0. Discriminant D = (1/4)^2 - 4(1/3)(-3) = 1/16 + 4 > 0, so roots are real. Other options have negative discriminants or lead to imaginary roots.

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  • Algebra (3715 questions)
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