woensdag 3 december 2014
Vergelijking opgelost...
\(
\eqalign{
& 3^{1 - x} + 3^x \cdot 3^2 = 6\sqrt 3 \cr
& \frac{3}
{{3^x }} + 9 \cdot 3^x = 6\sqrt 3 \cr
& 3 + 9 \cdot 3^{2x} = 6\sqrt 3 \cdot 3^x \cr
& 9 \cdot 3^{2x} - 6\sqrt 3 \cdot 3^x + 3 = 0 \cr
& y = 3^x \cr
& 9y^2 - 6\sqrt 3 \cdot y + 3 = 0 \cr
& 3y^2 - 2\sqrt 3 \cdot y + 1 = 0 \cr
& \left( {\sqrt 3 \cdot y - 1} \right)^2 = 0 \cr
& \sqrt 3 \cdot y = 1 \cr
& y = \frac{1}
{{\sqrt 3 }} = \frac{1}
{3}\sqrt 3 \cr
& 3^x = 3^{ - \frac{1}
{2}} \cr
& x = - \frac{1}
{2} \cr}
\)