Posted by Anonymous on Tuesday, January 8, 2008 at 2:35pm.
2xsquared11x21= ?
a=2
b=11
c=21
product= a*c
p=42>21 and 2
2xsquared21x2x21
x(2x21)2x21
this can't be the answer. am i missing a step? please help, thanks

algebra  drwls, 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)(x7) = 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^24ac)]/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  Simcha, Tuesday, January 8, 2008 at 3:02pm
possible technique to factor trinomials
in the form of ax^2+bx+c
diamond technique