QUESTION IS BELOW!!!!! please help me. ^.^

Question

anonymous · Answer

attachment

anonymous · Answer

d

anonymous · Answer

b shud be the correct one

pfenn1 · Answer

To determine which of these graphs was the right one, take a point on the line on one of the graphs and plug into the equation.

anonymous · Answer

check the discriminant,its coming to be greater than zero,that means there are two real and distinct value of x for which f(x)=0

pfenn1 · Answer

For instance on graph A, a point on the line is (2,1), plug it into the equation, if x=2, the equation gives me y=31, so A isn't correct.

anonymous · Answer

now to see the number of positive and negative roots, use descartes's rule of signs

anonymous · Answer

using that rule will give u 2 negative roots,therefore b shud be the correct one

anonymous · Answer

do u want me to explain descartes' rule of signs?

anonymous · Answer

no thank you ^.^  thanks alot really!!!