Answer:
c. two or none
Step-by-step explanation:
The signs of the coefficients are ...
+ - +
so there are <em>two</em> sign changes: + to -, and - to +. Descartes' rule of signs tells you to interpret this to mean there are 2 or 0 possible positive real roots.
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Pairs of roots are possibly complex, so the number of sign changes can be reduced by any even number to take that possibility into account. That is why 2 sign changes can mean either 2 or 0 positive real roots.
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A graph shows there to be 2 positive real roots and a root at x=0 with multiplicity 2. The latter should be no surprise, since x^2 is a factor of f(x).
Answer:
39
Step-by-step explanation:
4+3=7 7*6=42 42/1=42 42-3=39
Answer:
A)2y=x+2
Step-by-step explanation: