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Sagot :
[tex]800=0.1x^2-3x+22\\
0.1x^2-3x-778=0\\
\Delta=(-3)^2-4\cdot0.1\cdot(-778)=9+3112=3121\\
\sqrt{\Delta}=\sqrt{3121}\\
x_1=\dfrac{-(-3)-\sqrt{3121}}{2\cdot0.1}=\dfrac{3-\sqrt{3121}}{0.2}=15-5\sqrt{3121}\approx-264.3\\
x_2=\dfrac{-(-3)+\sqrt{3121}}{2\cdot0.1}=\dfrac{3+\sqrt{3121}}{0.2}=15+5\sqrt{3121}\approx294.3[/tex]
Approx. 294.3 ft/s
Approx. 294.3 ft/s
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