Find a cubic polynomial with the sum,sum of the product of its zeroes taken two at a time,and the product of its zeroes as $2, -7, -14$ respectively.

Vedclass pdf generator app on play store
Vedclass iOS app on app store
(A) Let the cubic polynomial be $p(x) = ax^3 + bx^2 + cx + d$ and its zeroes be $\alpha, \beta,$ and $\gamma$.
The relationships between the coefficients and the zeroes are given by:
$1.$ Sum of zeroes: $\alpha + \beta + \gamma = -b/a = 2/1$
$2.$ Sum of the product of zeroes taken two at a time: $\alpha\beta + \beta\gamma + \gamma\alpha = c/a = -7/1$
$3.$ Product of zeroes: $\alpha\beta\gamma = -d/a = -14/1$
Comparing the values,we get $a = 1, b = -2, c = -7,$ and $d = 14$.
Substituting these values into the general form $ax^3 + bx^2 + cx + d$,we get the polynomial:
$p(x) = x^3 - 2x^2 - 7x + 14$.

Explore More

Similar Questions

Find a quadratic polynomial,each with the given numbers as the sum and product of its zeroes respectively: $1, 1$.

Look at the graph given below. It is the graph of $y=p(x)$ where $p(x)$ is a polynomial. Find the number of zeroes of $p(x)$.

Give examples of polynomials $p(x), g(x), q(x)$ and $r(x),$ which satisfy the division algorithm and $\operatorname{deg} p(x)=\operatorname{deg} q(x).$

Look at the graph given below. It is the graph of $y=p(x)$ where $p(x)$ is a polynomial. Find the number of zeroes of $p(x)$.

Divide $3x^{3}+x^{2}+2x+5$ by $1+2x+x^{2}$.

Difficult
View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo