Multiple choice

Which of the following is a root of the quadratic equation x2 + 2x - 15 = 0?

  1. -3

  2. -6

  3. 5

  4. 3
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D Correct answer
Explanation

Factoring x^2 + 2x - 15 = 0 gives (x + 5)(x - 3) = 0. The roots are -5 and 3.

AI explanation

To find the roots, set the quadratic expression x squared plus 2x minus 15 equal to zero and factor it using the middle term splitting method. The middle term 2x splits into 5x and negative 3x, giving factors of (x + 5) and (x - 3). This gives the roots as negative 5 and 3, so 3 is a valid root.

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