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    whats the answer to quadratic equation x^2-3x-10=10

    0  Views: 364 Answers: 1 Posted: 12 years ago

    1 Answer

    x^2-3x-10=10


    Remember:  FOIL


    ( x + 2 ) ( x - 5 ) = 10


    F  >   First   >  x * x     =     x^2


    O  >  Outer  >  -5 * x   =   -5x


    I   >   Inner  >  2 * x     =     2x


                                                         -5x + 2x = -3x


    L  >  Last    >  2 * -5   =  -10


    ( x + 2 ) ( x - 5 ) = 10


    ( x + 2 ) = 10              ( x - 5 ) = 10


    x + 2 = 10                      x - 5 = 10


    x + 2 - 2 = 10 - 2            x - 5 + 5 = 10 + 5


            x = 8                                x = 15




     



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