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Form a polynomial f(x) when the degree is 5 and the zeros are 2, -i, i, 1-i, 1+i

 Sep 27, 2020
 #1
avatar+37167 
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(x-2)(x+i)(x-i)(x -1+i)(x-1-i) =   polynomial 

    multiply all of this out to get:

 

x5 - 4x4 + 7x3 - 8x2 +6x -4

 Sep 28, 2020
 #2
avatar+15069 
+2

Form a polynomial f(x) when the degree is 5 and the zeros are 2, -i, i, 1-i, 1+i

 

Hello Guest!

 

f(x)=(x+i)(xi)(x1+i)(x1i)(x2)=(x2+1)(x2)(x2xixx+1+i+ixi+1)=(x2+1)(x2)(x22x+2)=(x2+1)(x32x2+2x2x2+4x4)=(x2+1)(x34x2+6x4)

=x54x4+6x34x2+x34x2+6x4=x54x4+7x38x2+6x4

laugh  !

 Sep 28, 2020

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