Consider the quadratic equation x^2-28x+m=0 where m is a constant what must be the value of m to make the quadratic equation a perfect square trinomial

Autility company burns coal to generate electricity. the cost c(p), (in dollars) of removing p percent of the some stack pollutants is given by c(p)= 85000p/100-p a) find the cost to remove 30% of the pollutant b) find where the function is undefined

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Graph each quadratic function and identify its key characteristics. f(x) = x^2 - 2x - 3