What is the discriminant of the quadratic equation 0 = -x2 + 4x – 2?

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest

Three runners competed in a race data were collected at each mile mark for each runner if the runner ran at a constant pace the data would be linear