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how to solve quadratic equation

Would you help me solve this quadratic equation
 
 
                       ___________________
          -9.7  - √ 9.7^2 + 4(24.61)(16)
 
 
 
thanks

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BRUCE S. | Learn & Master Physics & Math with Bruce SLearn & Master Physics & Math with Bruce...
4.9 4.9 (36 lesson ratings) (36)
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See the previous question's solution.
Use the form of the quadratdic equation and it's solution equation for s to find a, b, c.
William S. | Experienced scientist, mathematician and instructor - WilliamExperienced scientist, mathematician and...
4.4 4.4 (10 lesson ratings) (10)
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-9.7 - [(9.7)2 + 4(24.61)(16)]1/2 = = -9.7 - (1669.13)1/2 = -9.7 - 40.9 = -50.6