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Posted by on Tuesday, January 8, 2008 at 2:35pm.

2xsquared-11x-21= ?
a=2
b=11
c=21
product= a*c
p=42>21 and 2
2xsquared-21x-2x-21
x(2x-21)-2x-21
this can't be the answer. am i missing a step? please help, thanks

  • algebra - , Tuesday, January 8, 2008 at 2:53pm

    You are not starting out with an equation, since you have no number on the right side, just a ?. Therefore x could be anything

    If you are supposed to solve the equation
    2x^2 -11 x -21 = 0,
    then factor it into
    (2x +3)(x-7) = 0
    That tells you that the answers are x = -3/2 and x = 7.
    If you are trying to use the quadratic formula
    x = [-b +/- sqrt(b^2-4ac)]/2a
    to get the answers, then b = -11 and c = -21. You got the signs wrong. I have no idea what your a*c product and p are supposed to sigfnify.

  • algebra - , Tuesday, January 8, 2008 at 3:02pm

    possible technique to factor trinomials
    in the form of ax^2+bx+c
    diamond technique

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