I'll explain why in a bit but for now I just really need the answer!
2006-10-12 06:04:48 · 17 answers · asked by mr_sporty_spice 2 in Science & Mathematics ➔ Mathematics
The factorization (hopefully) has the form
(2x+a)(x+b)
where a+2b = 3 and ab = -2. a and b have opposite signs because their product is negative. Trying factors of 2 for a and b does the job: pick a=-1 and b=2. Then you have
(2x-1)(x+2) = 0.
2006-10-12 06:07:25 · answer #1 · answered by James L 5 · 2⤊ 0⤋
Many of the answers give you the solution. Some show you the working and others do more work than is asked for.
The question asks you to FACTORISE. It does not ask you to solve it. So there is no need to work out the values of x for which the equation is correct. In an exam that will just waste your time and you will not get extra marks
You need to show your working clearly.
2x^2 + 3x -2 = 0
2x^2 + 4x - x -2 = 0
2x(x + 2) -1(x + 2) = 0
(x + 2) (2x -1) = 0
You could leave your answer as the final line above i.e you have factorised the equation but if the question asks you to find the factors then end with:
Hence the factors are (x + 2) and (2x - 1)
Hope this bit of extra advice helps you. Good luck.
2006-10-12 19:22:54 · answer #2 · answered by Anonymous · 1⤊ 0⤋
x= -2 or x = 1/2
2006-10-12 06:06:48 · answer #3 · answered by ZOMBIEEE 2 · 1⤊ 0⤋
2x^2 + 3x -2 = 0 factorises into
(2x-1)(x+2) = 0
2006-10-12 07:36:40 · answer #4 · answered by Anonymous · 1⤊ 0⤋
2x^2 + 3x - 2 = 0
(2x-1)(x+2) = 0
x = 1/2 or -2
2006-10-12 12:14:33 · answer #5 · answered by Kemmy 6 · 1⤊ 0⤋
2x^2 + 3x - 2 = 0
(2x-1)(x+2)
check
2x^2+4x-x-2
2x^2+3x-2
2006-10-12 06:56:28 · answer #6 · answered by yupchagee 7 · 1⤊ 0⤋
9
2006-10-12 06:14:56 · answer #7 · answered by Musics in my soul 2 · 0⤊ 2⤋
(2x-1)(x+2) = 0
2006-10-12 06:06:17 · answer #8 · answered by jimvalentinojr 6 · 1⤊ 0⤋
2x^2 + 4x - x - 2 = 0
2x(x+2) - 1(x+2) = 0
(2x-1) (x+2) = 0
Thus, the factor is
x = 1/2, and x = -2
2006-10-12 07:01:16 · answer #9 · answered by wilsey l 2 · 2⤊ 0⤋
2x^2 + 3x - 2 = 0
2x^2 +4 x -x - 2 = 0
2x( x +2) -1(x+2) =0
(2x-1)(x+2)=0
2x=1 or x+2=0
x=1/2 or x= -2.
2006-10-12 06:14:37 · answer #10 · answered by Anonymous · 2⤊ 0⤋