Its been so long I've forgotten how to do this kind of math...
Which of the following is a factor of the equation:
2x^2 + x - 1?
A. (x - 1)
B. (2x - 1)
C. (x + 2)
D. (2x + 1)
2007-08-07 19:28:00 · 3 answers · asked by Chris 2 in Science & Mathematics ➔ Mathematics
2x² + x - 1 = (2x - 1 )(x + 1)
ANSWER B
2007-08-07 19:32:19 · answer #1 · answered by Como 7 · 1⤊ 0⤋
B is the answer
first make your two sets of ( )
you know the first things in those sets has to be 2x and x
you also know that 1 must be the second thing in both
the only thing to figure out now is the signs
it currently should look like (2x 1) (x 1)
since the last term is -1 you know that the signs must be + and -
by placing a - in the first set of ( ) you get your answer of
(2x - 1) (x + 1)
*fyi when you FOIL you get 2x^2 + 2x - x - 1 then add your two middle terms for x
2007-08-08 02:41:52 · answer #2 · answered by Joe M 2 · 0⤊ 1⤋
Factorising the equation 2x^2 + x - 1,
2x^2 + x - 1 = (x + 1)(2x - 1)
Therefore, the answer is B as (2x - 1) is a factor of the equation.
2007-08-08 02:30:27 · answer #3 · answered by Anonymous · 0⤊ 0⤋