RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 2. Polynomials

Subject: Maths - Class 10th

Q. No. 9 of CCE - Formative Assessment

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If the diagram in Fig. 2.22 shows the graph of the polynomial f (x) = ax2 + bx + c, then

As seen from the graph,

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

Hence, both the roots are positive.

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

α + β = -b/a

the sum will be positive as the roots are positive.

Also, the product of roots = c/a has to be positive too.

a is positive.

Now, since a is positive, therefore for the sum of roots to be negative, b has to be negative.

a > 0, b< 0 & c > 0.

Therefore, option (a) is correct.

Chapter Exercises

More Exercise Questions


The sum and product of the zeros of a quadratic polynomial are and — 3 respectively. What is the quadratic polynomial?