Ask your own question, for FREE!
Mathematics 100 Online
OpenStudy (anonymous):

solve the inequality for x x^3-5x greater then or equal to 4x^2 i simplified to x(x+5)(x-1) but its saying that is incorrect

OpenStudy (anonymous):

\[x^{3}-5x \ge 4x ^{2}\]

OpenStudy (anonymous):

I'm solving hold on

OpenStudy (anonymous):

i figured it out and its \[x(x-5)(x+1)\] how do i figure out which are included in the solution set

OpenStudy (anonymous):

\[x^3-5x\geq 4x^2\] \[x^3-4x^2-5x\geq0\] \[x(x^2-4x-5)\geq 0\] \[x(x+4)(x-5)\geq0\] zeros are at -4, 0 and 5and since this is a cubic polynomial with positive leading coefficient, it will be negative, then positive, then negative, then positive (think of the picture) you want it to be positive, so answer is \[[-4,0]\cup [5,\infty)\]

OpenStudy (anonymous):

in your head draw this picture |dw:1314549885298:dw|

OpenStudy (anonymous):

it says the answer is (-1,0] U [5, infinity)

OpenStudy (anonymous):

because if you factor out (x+4)(x-5) you get \[x ^{2}-1x-30\] which isnt what i want

OpenStudy (anonymous):

solution x>=5 -1<=x<=0

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Latest Questions
notmeta: help
34 minutes ago 4 Replies 0 Medals
toga: why are you not supposed to pop pimples
53 minutes ago 11 Replies 1 Medal
zombieblud: Help
1 hour ago 4 Replies 2 Medals
KarmaXD: How do u tell your crush u like him/her???
31 minutes ago 2 Replies 0 Medals
PureSoulless: (Genuine question.) Is being a femboy gay?
9 hours ago 0 Replies 0 Medals
Abby13915: A drawing I did March-
1 hour ago 8 Replies 2 Medals
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!