GIVING BRAINLIEST PLEASE HELP!! -if you answer correctly ill give you brainliest which will give you 30pts-

If x=-3 is the only x-intercept of the graph of a quadratic equation, which statement best discribes the discriminant of the equation?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

The graph of a function f(x)=(x+2)(x-4). which describes all of the values for which the graph is negative and increasing? all real values of x where x< -2 all real values of x where -2