1. Have a look here: http://www.mathhelpforum.com/math-he...-tutorial.html
2. Actually there are 4 zeros if you count the -1 twice. The graph of the function touches the x-axis at x = -1. (In Germany such a case is considered to be a double-zero)
For some reason this is throwing me off.
Given :
Already found one zero at -1. Book has 3 zeros but given that it's degree 4 shouldn't it have 4 zeros?
And how do I get the complex zeros?
Sorry for having to use pics but i cant figure out the way you all do it yet
1. Have a look here: http://www.mathhelpforum.com/math-he...-tutorial.html
2. Actually there are 4 zeros if you count the -1 twice. The graph of the function touches the x-axis at x = -1. (In Germany such a case is considered to be a double-zero)