Question

Find the roots of $7m^2-84=0$

• A. $+2\sqrt{3}$
• B. $-2\sqrt{3}$
• C. $\pm 2\sqrt{3}$
• D. None of the above

Answer 1

The correct option is C $\pm 2\sqrt{3}$

Now, the given quadratic equation is:

$7m^2-84=0$
Thus, $7m^2=84$

Or, $\to m^2=12$
$\to$ $m=\sqrt{12}$

Thus, $m=\pm 2\sqrt{3}$

Therefore, the correct answer is $C$