Question

Does anybody know this???

Answer 1

So for this you will be doing proportions. And in this case, the proportion is $\frac{9}{x} =\frac{x}{12}$

Firstly, you'll need to cross multiply. Your equation will look like this: $108=x^2$

Finally, square root each side and your answer will be $\sqrt{108}=x$. However this can be simplified.

$\sqrt{108} =\sqrt{18*6}=\sqrt{9*2*3*2}=2\sqrt{3*3*3} =3*2\sqrt{3} =6\sqrt{3}$

In short, your answer is $6\sqrt{3}$