Expand (-x) (x-4) (2x+1)
2007-06-16 10:20:28 · 4 answers · asked by Emad K. 2 in Science & Mathematics ➔ Mathematics
(x-4)(2x+1)=x*2x+x-4*2x-4=2x^2+x-8x-4=2x^2-7x-4
(2x^2-7x-4)(-x)=-2x^3+7x^2+4x
2007-06-16 10:24:08 · answer #1 · answered by WraitH 3 · 1⤊ 0⤋
The process is to expand each term in turn.
First apply the (-x) to both the other terms:
They become (-x^2 -4x) (2 x^2 -x)
Second cross-multiply them with each other:
Apply the first term (-2x^4 +2x^3)
Apply the second term (-8x^3 +4x^2)
Third collect the like terms: -2x^4 -6x^3 +4x^2
2007-06-16 17:36:08 · answer #2 · answered by Robert S 7 · 0⤊ 0⤋
(-x) (x-4) (2x+1)
(-x) (2x^2 +x -8x-4) = (-x) (2x^2 - 7x -4)
-2x^3 + 7x^2 + 4x
2007-06-16 17:28:37 · answer #3 · answered by CPUcate 6 · 0⤊ 0⤋
whoa thats impossible. I know you have to do the stuff in brackets first but i have no idea how to do that. Sorry
2007-06-16 17:24:55 · answer #4 · answered by ɭɑɽɑ 3 · 0⤊ 2⤋