Question

Which of the following represents the zeros of f(x) = x3 − 4x2 − 5x + 20? (2 points) −4, −square root of 5 , −square root of 5 4, square root of 5 , −square root of 5 4, −square root of 5 , −square root of 5 −4, square root of 5 , square root of 5

Answer 1

Since you copied and pasted this from an online test in your class, it did not format correctly so is pretty tough to figure out what it is supposed to be saying. An easy way for you to find the roots is to first graph to get a root where the graph crosses the x axis. Then use synthetic division for that root to break it down to a quadratic, then use quadratic formula to find the other two roots. 

Answer 2

4, square root of 5, -square root of five