Posted by **Anonymous** 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 -
**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)(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 -
**Simcha**, 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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