Multiple choice

Zeros of the quadratic equation $x^{2} + 9 = 0$ are

  1. $\pm 3$
  2. $\pm 3i$
  3. $\pm 81$
  4. $\pm 81i$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

x^2 + 9 = 0 => x^2 = -9. x = sqrt(-9) = +/- 3i.

AI explanation

To find the zeros of the equation, we equate x squared plus 9 to 0, which gives x squared equals -9. Taking the square root of both sides yields x equals the square root of -9. Since the square root of a negative number involves the imaginary unit i, the roots are plus or minus 3i.

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