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what 2 sum numbers equal 7.5 and product 13.5

 Sep 14, 2020
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what 2 sum numbers equal 7.5 and product 13.5

 

Hello Guest!

 

\(xy=13.5\\ x+y=7.5\)

 

\(y=7.5-x\\ x(7.5-x)=13.5\\ 7.5x-x^2=13.5\)

\(x^2-7.5x+13.5=0\)

           p            q

\(x=- \frac{p}{2}\pm\sqrt{(\frac{p}{2})^2-q}\)

\(x=3.75\pm\sqrt{3.75^2-13.5}\\ x=3.75\pm0.75\)

\(x_1=4.5\\ x_2=3\)

\(y=7.5-x\)

\(y_1=3\\ y_2=4.5\)

 

\(4.5\times 3=13.5\\ 4.5+3=7.5\)

laugh  !

 Sep 14, 2020

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