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askme12345Best ResponseYou've already chosen the best response.1
substitute all your x's for negative x :)
 2 years ago

sonicfan12Best ResponseYou've already chosen the best response.0
Will you show me an example please?
 2 years ago

LagrangeSon678Best ResponseYou've already chosen the best response.0
first count the sign changes in the original polynomial, the compute f(x) and count the sign changes
 2 years ago

askme12345Best ResponseYou've already chosen the best response.1
Sure  Lets say your equation is 5x^3 + 4x^2  5x So you have negative, positive, negative = this means 3 positive zeros (when youre solving for zeros) decartes rule says when you put x into the equation you'll get your negative zeros .. here we go 5(x)^3 + 4(x)^2 5(x) (All even powers, will become negative, odds stay the same) 5x^3  4x2 + 5x .. so we have postive to negative to positive .. therefore 3 positive zeros
 2 years ago

satellite73Best ResponseYou've already chosen the best response.0
purplemath has a good example and explanation
 2 years ago

satellite73Best ResponseYou've already chosen the best response.0
http://www.purplemath.com/modules/drofsign.htm
 2 years ago

sonicfan12Best ResponseYou've already chosen the best response.0
Thanx for the help! XD
 2 years ago
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