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

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

If you answer 2+2 you will get over 80 points

Which graph represents the same relation is the sa which graph represents the same relation as the set {(-3-2)}