5x^5+3x^4-90x-18 ---factor completely
I came up with
(x^-18) (5x+3) (5x+1)
So does this mean that this problem is not factorable
2006-07-28 06:32:20 · 3 answers · asked by sabrina s 2 in Science & Mathematics ➔ Mathematics
(5x^5+3x^4) + (-90x-18)
x^4(5x+3) -18(5x+1)
Stuck. If the first 5 is supposed to be a 15, the problem is factorable. Otherwise, it is not.
2006-07-28 06:38:17 · answer #1 · answered by jenh42002 7 · 0⤊ 0⤋
=> 5x^5+3x^4-90x-18
=> x^4(5x+3)-18(5x+1)
it cannot be factorized anymore. and by the way, you made a mistake; you can not combine x^4 and -18 because the (5x+3) and (5x+1) are not the same.
If the first 5 was 15, you would be able to continue factoring further. but in this case, you can't.
2006-07-28 15:14:40 · answer #2 · answered by Anonymous · 0⤊ 0⤋
No, it means you got the answer wrong.
The numbers in the brackets should make -18 when multiplied together, but -3*1 obviously don't.
Also, there are no x*-18 in the equation so the solution won't have them usually if the maximum power is less.
You'r solution when multiplied out is actually:
(x^-18)(25x^2+20x+3) = 25x^-16+20x^-17+3x^-18
Try again!
2006-07-28 13:44:29 · answer #3 · answered by Anonymous · 0⤊ 0⤋