aidez moi svp urgent.... Pergunta de ideia dejulie1074

julie1074 @julie1074

June 2021 1 29 Report

aidez moi svp urgent

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maths717 A) x^4-13x²+36=0 (X=x²)
X²-13X+36=0
delta= 25
X1=9 X2=4
x=3 ou x=-3 ou x=2 ou x=-2

b) x^4-5x²+4=0 (X=x²)
X²-5X+4=0
delta= 9
X1= 4 X2= 1
x=2 ou x=-2 ou x=1 ou x=-1

c) x^4+x²-2=0 (X=x²)
X²+X-2=0
delta= 9
X1=4 X2=1
x=2 ou x=-2 ou x=1 ou x=-1

d) 9x^4-85x²+196=0 (X=x²)
9X²-85X+196=0
delta= 169
X1=49/9 X2=4
x=7/3 ou x=-7/3 ou x=2 ou x=-2

e) 3x^4-7x²+4=0 (X=x²)
3X²-7X+4=0
delta=1
X1=4/3 X2=1
x=racine4/3 ou x=-racine4/3 ou x=1 ou x=-1

f) x²+1/x²-6=0
pour celle la je ne sais pas par contre

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