Explanation:
what do we need to do ?
apply the general solution to such a quadratic equation and calculate the 2 solutions for x ?
yes, you started correctly.
x = (-11 ± sqrt(11² - 4×10×-6))/(2×10) =
= (-11 ± sqrt(121 + 240))/20 =
= (-11 ± sqrt(361))/20 =
= (-11 ± 19)/20
x1 = (-11 + 19)/20 = 8/20 = 2/5 = 0.4
x2 = (-11 - 19)/20 = -30/20 = -3/2 = -1.5