SOLUTION: What are the Real zeros for f(x) = x^3+2x^2-4

Algebra ->  Rational-functions -> SOLUTION: What are the Real zeros for f(x) = x^3+2x^2-4       Log On


   



Question 312985: What are the Real zeros for f(x) = x^3+2x^2-4

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
+graph%28+300%2C+300%2C+-5%2C+5%2C+-10%2C+10%2C+x%5E3%2B2x%5E2-4%29+
I used Newton's method,
x(n+1)=x(n)-f(x(n))/f'(x(n))
with a starting value of x0=1 and got a value of x=1.130395 after 3 iterations.