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Multiple choice

If $a$ and $b$ are the roots of the equation $-2.5x^2+10x-7.5=0$, then the value of $|a-b|$ is

  1. $2$
  2. $1$
  3. $4$
  4. $3$
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A Correct answer
Explanation

For -2.5x^2 + 10x - 7.5 = 0, divide by -2.5 to get x^2 - 4x + 3 = 0. Roots are 1 and 3. |a-b| = |1-3| = 2.

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