Nord-Trøndelag is a county in Norway, bordering Nordland and Sør-Trøndelag. In 2002 there were 127,457 inhabitants, which is 2.8% of the total population in Norway. Its area is 22,396 km². The county administration is in Steinkjer.
... quadratic formula expresses the explicit solution(s) x to the quadratic equation
<math>ax^2+bx+c=0</math>
in terms of the coefficients a, b and c, ...