Q. 10

Figure 2.23 shows the graph of the polynomial f(x) = ax2 + bx + c for which


A. a < 0, b > 0 and c > 0

B. a < 0, b < 0 and c > 0

C. a < 0, b < 0 and c < 0

D. a > 0, b > 0 and c < 0

Answer :

As seen from the graph,


The parabola cuts the graph at two points on the x axis.


One root is positive & one root is negative.


Now, for a polynomial, the sum of roots is given as:


α + β = -b/a


Also, the product of roots = c/a is positive.


Because c is positive,


a is negative & b is negative.


Therefore, option (b) is correct.

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