Polynomial
I'm using Descartes rule of signs, and getting 1 sign change in f(x) and 4 sign changes in f(-x) meaning 5 real roots so acc to me then sum of non real roots should be 0, but that's not correct.
So what's the mistake?
11 Replies
@Apu
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.ryt ans. : -2
*at most 5 real roots.
Remember, Descartes' method only gives you an upper bound.
Ok, by trial and error, ±2 are roots
So you can divide by x±2 to get a cubic
And I'm stuck there now
Check this out
....how'd you think of factoring out 37??
Of all numbers
taking out 13 common from 39 and 481
got an idea for 37
did u get it?
Yeah, but it's just not something you'd think of in the exam
ryt
+solved @Opt
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