Pls help no links i need this asap if possible

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x