Write whether the following statements are true or false. Justify your answers.
$(i)$ If the coefficient of $x^{2}$ and the constant term have the same sign and if the coefficient of $x$ term is zero,then the quadratic equation has no real roots.
$(ii)$ Every quadratic equation has at least two roots.

Vedclass pdf generator app on play store
Vedclass iOS app on app store
(A) $(i)$ True. For a quadratic equation $ax^{2} + bx + c = 0$,the discriminant is $D = b^{2} - 4ac$. Given $b = 0$,we have $D = -4ac$. If $a$ and $c$ have the same sign,then $ac > 0$,which implies $D = -4ac < 0$. Since the discriminant is negative,the equation has no real roots.
$(ii)$ False. $A$ quadratic equation has exactly two roots (which may be real and distinct,real and equal,or complex/imaginary). It does not necessarily have "at least" two roots in the context of real numbers,and it cannot have more than two roots.

Explore More

Similar Questions

Obtain the roots of the following equation using the method of 'completing the square': $5x^{2} - 4x - 10 = 0$.

Difficult
View Solution

$A$ train,travelling at a uniform speed for $360\, km$,would have taken $48\, min$ less to travel the same distance,if its speed were $5\, km/h$ more. Find the original speed of the train (in $km/h$).

Difficult
View Solution

Obtain the roots of the following equation using the method of 'completing the square': $3y^{2} + 7y - 20 = 0$.

Find the roots of the following quadratic equation by the method of completing the square: $4x^{2} + 4bx - (a^{2} - b^{2}) = 0$.

Find the discriminant of the following quadratic equation: $9x^{2} - bx + 3 = 0$.

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