Decartes Rules
posted by Ash .
Use Decartes Rule of signs to determine the possible number of postive and negative real zeros for the given function. Please check my answers?
1. f(x)=7x^9+x^5x^2+6
This is what I did:
There are 2 sign changes
f(x)=7(x)^9+(x)^5(x)^2+6
There are 2 sign changes
So, are there 2 or 0 positive zeros, 2 or 0 negative zeros?
2. f(x)10x^38x^2+x+5
There are 2 sign changes
f(x)=10(x)^38(x)^2+(x)+5
There are 2 sign changes
So, are there 2 or 0 positive zeros, no neggative zeros?
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