SOLUTION: For the following find the real zeros of f.Use the real zeros to factor f f(x)=x^3+5x^2-17x-21

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: For the following find the real zeros of f.Use the real zeros to factor f f(x)=x^3+5x^2-17x-21      Log On


   

Question 859378: For the following
find the real zeros of f.Use the real zeros to factor f
f(x)=x^3+5x^2-17x-21
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
factors of 21: 1,3,7,21
applying synthetic division we use -1 to get
x^2+4x-21
next we factor to get
(x+7)(x-3)
therefore...
zeros: {-7,-1,3}