Question

If one of the roots of the equation $k{x}^2-7x+3=0$ is $3$, then $k=$ _______.

• A. $-3$
• B. $3$
• C. $-2$
• D. $2$

Answer 1

The correct option is D $2$

One root of the equation, $k{x}^2-7x+3=0$ is $3$
$\therefore k(3{)}^2-7(3)+3=0$
$\therefore 9k-21+3=0$
$\therefore 9k=18$
$\therefore k=2$