Asked by Anonymous
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
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
Answers
Answered by
drwls
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.
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.
Answered by
Simcha
possible technique to factor trinomials
in the form of ax^2+bx+c
diamond technique
in the form of ax^2+bx+c
diamond technique
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