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Matrix Determinant Product

Let $ \mathbf{A} $ and $ \mathbf{B} $ be $ 2 \times 2 $ matrices such that $ \det \mathbf{A} = -1 $ and $ \det \mathbf{B} = 3 $. Find $ \det (3 \mathbf{A} \mathbf{B}) $.

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$\frac{a}{b}$
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0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$