Answer
 = -24
Step-by-step explanation
The discriminant helps us determine the nature of the roots of a quadratic equation
When using the quadratic formula the find the roots of a quadratic equation, the term (b²-4ac) is known as the discriminant. 
Where b ⇒ coefficient of the 2nd term 
 a ⇒ coefficient of the 1st term
 c ⇒ the 3rd term.
 In the equation 3x²-6x+5, the discriminant is; 
(-6)² - (4×3×5) = 36 - 60
  = -24