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DarkBlueChocobo
 one year ago
Help with polynomials
DarkBlueChocobo
 one year ago
Help with polynomials

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DarkBlueChocobo
 one year ago
Best ResponseYou've already chosen the best response.0@mathstudent55

DarkBlueChocobo
 one year ago
Best ResponseYou've already chosen the best response.0I don't understand how to find it :/

sepeario
 one year ago
Best ResponseYou've already chosen the best response.0I think you expand it and then use discriminant?

DarkBlueChocobo
 one year ago
Best ResponseYou've already chosen the best response.0Can you explain the discriminant

phi
 one year ago
Best ResponseYou've already chosen the best response.2the "roots" of a polynomial are the x values that make the polynomial zero. here you have \[ (x4)^2 (x^2+4) = 0\] or \[ (x4) (x4) (x^2+4) = 0\] as you can see, if x= 4 (twice, so it is a repeated root) you get zero you would also get 0 if x^2+4=0 or \( x^2= 4 \) take the square root of both sides and you get \[ x= 2i \text{ or } x=2i\] the 4 roots are: 4,4,+2i, 2i

phi
 one year ago
Best ResponseYou've already chosen the best response.2Statement I is true: you have two imaginary roots: 2i and 2i II is false: you do have the real root 4 III is true: you have four complex roots, namely 4,4, 2i and 2i statement III is a bit tricky, because we must recognize that pure real (like 4) and pure imaginary (like 2i) can both be categorized as complex.
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