Find the value of x: 2x^3 - 5x^2 - x + 20 = 0

Question

Find the value of x:  2x^3 - 5x^2 - x + 20 = 0

anonymous · Answer

would you like to go for a trignometric solution ?

anonymous · Answer

I just need the value of x :o  the answers have 2 x values. Its a whole different equation but Ive added everything and I just needed help on finding the x values of this because It confused me

anonymous · Answer

what is the ans.?

anonymous · Answer

if you want soln,,i can provide hint : see shubhamsrg's soln : http://openstudy.com/users/shubhamsrg#/updates/4fed5f8ae4b0bbec5cfcc1ac

anonymous · Answer

first you have to convert the eqn into depressed but..

anonymous · Answer

1: x= -4/3, x= -5
2: x= -4/3, x= 5
3:x= 4/3, x= -5
4:x= 4/3, x= 5

anonymous · Answer

http://www.wolframalpha.com/input/?i=2x%5E3%2B-5x%5E2-x%2B20%3D0

anonymous · Answer

I tried plugging it into wolframalpha already.. didnt work -_-

anonymous · Answer

didn't work!
there the ans. given is -1.6

anonymous · Answer

Ok that gives me one answer but :o

anonymous · Answer

I guess ill just try Plugging 5 and negative 5 into the original thing.. Thanks :p

anonymous · Answer

Wait can Someone actually Help me? Cause Ive tried plugging the two 5's in but Its not equaling out.  @Wired @JohnHanShanghai  , the original equation is this,

anonymous · Answer

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