Q14Multiple correct5 Marks24 Oct 2024

Which of the following options is/are true?

A

If $T$ is the set $\{a,b,c,d\}$, then cardinality of the set $T\times T$ is $16$.

B

The minimum value of the quadratic expression $f(x)=3x^2-18x+20$ is $-20$.

C

For a quadratic equation $ax^2+bx+c=0$, where $a,b,c$ are integers with $a\ne 0$, if $b^2-4ac>0$ and a perfect square, then there exists a rational root of the quadratic equation.

D

A line with an undefined slope is parallel to the $Y$-axis.