impossible polynomial (1 Viewer)

[MC Squidge]

solve x^3-5x^2+11=0

 

[Timothy.Siu]

how is x=2 a zero
edit: lol he deleted his post

 

[shaon0]

how is x=2 a zero
edit: lol he deleted his post

yeah sorry about that. It's been a while since polynomial, For factor theorem to work, x=(+-11,+-1) should work since 11 is prime but it doesn't. I think it'll have some really big irrational solution if the roots are real.

 

[Timothy.Siu]

yeah thats right.
so the original question is dumb basically.

 

[shaon0]

yeah thats right.
so the original question is dumb basically.

Probably have to approximate the roots of the equation.

 

[MC Squidge]

so the roots can be irrational?

 

[shaon0]

so the roots can be irrational?

Yeah, since the degree of the polynomial is 3 and the co-efficients are real. There can be unreal roots.

 

[cutemouse]

Here, I've done all the hard work....



So, it's not impossible... All you need is a bit of persistance and patience =D (and some other stuff =P)

 

[shaon0]

Here, I've done all the hard work....



So, it's not impossible... All you need is a bit of persistance and patience =D (and some other stuff =P)

looks like 'you' used the cubic formula.

 

[cutemouse]

Nope, I didn't =D

I used a much easier method/way

 

[riseek]

could u please explain

Nope, I didn't =D

I used a much easier method/way

 

[jet]

he.... made someone else use the cubic formula and he typed out the answers????

 

[tommykins]

x = -1.319350320, 1.876666879, 4.442683441

 

[shaon0]

Nope, I didn't =D

I used a much easier method/way

online polynomial solver?

 

[cutemouse]

online polynomial solver?

Close - I have Wolfram Mathematica on my computer =D Nice thing to have, once you get to know how to use it. =P

 

[omniscience]

your face is impossible bro

 

[Dragonmaster262]

solve x^3-5x^2+11=0

Did you get this from Cambridge?

 

[MC Squidge]

no i got it from a friend who asked me it and laughed at me when i couldnt solve it