Rita bought 3 CDs that were each the same price. Including sales tax, she paid a total of $51.30. Each CD had a tax of $1.20. What was the price of each CD before tax?

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Ответ:

antcobra

24.09.2021

Mathematics

we can make this...

9x+2=0

and

then...

$\boxed{x=-\frac{2}{9}}$

4x^2+35x-9=0

$x=\frac{-b\pm\sqrt{b^2-4*a*c}}{2*a}$

$x=\frac{-35\pm\sqrt{35^2-4*4*(-9)}}{2*4}$

$x=\frac{-35\pm\sqrt{1369}}{8}$

$x=\frac{-35\pm37}{8}$

$x_1=\frac{-35+37}{8}=\frac{1}{4}$

$x_2=\frac{-35-37}{8}=-9$

$\boxed{\boxed{S=\{\frac{1}{4},-\frac{2}{9},-9\}}}$

I'm sure about my answer, don't matter the order...

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