Home Forums Math Which equation shows the quadratic formula used correctly to solve 7×2 = 9 + x for x?

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  • #10019
    hemanthk
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      Can somebody please add the answer!

      #10022
      hemanthk
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        For this case we have the following quadratic equation:
        7x²=9+x
        Rewriting the equation we have:
        7x² – x – 9 = 0
        Here, a = 7, b = -1, c = -9
        Now, b² – 4ac
        (-1)² – 4.7.(-9)
        1+252
        253
        Therefore,

        – b±(b²-4ac)^1/2
        x = ———————
        2a

        – (-1)±(253)^1/2
        x = ——————
        2.7

        1±(253)^1/2
        x = —————
        14

        #10034
        hemanthk
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          For this case we have the following quadratic equation:
          7x²=9+x
          Rewriting the equation we have:
          7x² – x – 9 = 0
          Here, a = 7, b = -1, c = -9
          Now, b² – 4ac
          (-1)² – 4.7.(-9)
          1+252
          253
          Therefore,
          x = – b±(b²-4ac)^(1/2) / 2a

          x = – (-1)±(253)^(1/2) / 2.7

          x = 1±(253)^(1/2) / 14

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