Multiple choice general knowledge math & puzzles

Twice a negative integer is eight less than its square. Find that number!

  1. 8

  2. 16

  3. -64

  4. -2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let the number be $x$. The equation is $2x = x^2 - 8$, which simplifies to $x^2 - 2x - 8 = 0$. Factoring gives $(x-4)(x+2) = 0$. Since the question specifies a negative integer, $x = -2$.

Keep practicing — related questions