Multiple choice

Which of the following options is the discriminant of the quadratic equation 2x2 + 5x + 2 = 0?

  1. 3
    • 9

  3. 9
    • 2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For ax^2 + bx + c = 0, discriminant D = b^2 - 4ac. Here a=2, b=5, c=2. D = 5^2 - 4(2)(2) = 25 - 16 = 9.

AI explanation

The discriminant of a quadratic equation ax2 + bx + c = 0 is given by the formula D = b2 - 4ac. For the equation 2x2 + 5x + 2 = 0, the values are a = 2, b = 5 and c = 2. Substituting these gives D = 52 - 4(2)(2) = 25 - 16 = 9.

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