The discriminant tells us there are two roots when positive, one root when zero, and no roots when negative. #b^2-4ac = (-8)^2-4*3*1 = 52# is positive, so there are two roots. The discriminant is just part of the quadratic equation. The quadratic equation gives us the exact real number roots of any equation in the form #ax^2+bx+c=0#. The quadratic equation is #x = (-b \pm sqrt(b^2-4ac))/(2a)#, where #\pm# means that we have two values, one using #+# (addition) and one using #-# (subtraction).
Head Lice vs. Dandruff: How to Tell the Difference. Head lice and dandruff are two completely different things, yet people often mistake one for the other. Head lice are parasites that feed on human blood, and are spread through contact with others. Their bites cause an itchy scalp and occasionally an allergic reaction. Dandruff is a skin condition on the scalp that causes flaking of the skin and a slightly itchy scalp. Here's how to tell the difference between the two. Head lice are small, brown parasites with six legs about the size of a sesame seed. They have elongated bodies, with small, oval shaped heads.
Lice are commonly found in the hair, while ticks can be found all over the body, including hair, arms, stomach, clothes, etc. Ticks and lice are often confused as the same due to their similarities in appearance; however they differ from each other in many ways.