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    75=(x^2 + 5x)/200 whats the value for x

    +1  Views: 639 Answers: 4 Posted: 6 years ago

    4 Answers

    75 = (x^2 + 5x) 


                200


    Multiply both sides by 200


    200(75 = (x^2 + 5x) 


                        200


    15000 = x^2 + 5x


    To solve, I would rewrite the equation so I could solve it by using the Quadratic Formula.


    Quadratic Formula: ax^2 + bx + c = 0   Quadratic Formula 


     


    x^2 + 5x = 15000  


    x^2 + 5x -15000 = 0  >  a = 1,  b = 5,  c = -15000


    x = -5 +- square root of (5)^2 - 4(1)(-15000)  


                                  2(1)


          -5 +- square root of 60025   


                            2


                -5 +- 245    


                      2


      x =    -5 + 245   and  x =   -5 - 245   


                    2                              2


                       


             x = 120    and      x = -125 

    120

    Here, dude  go to the homework site; http://www.khanacademy.org/

    X can be 120 or X can be -125



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