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4777222
@4777222
May 2022
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(x^2+2x)^2-(x+1)^2-55=0
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sedinalana
(x^2+2x)^2-(x+1)^2-55=0
(x
²+2x)²-(x²+2x+1)²-55=0
x²+2x=t
t²-(t+1)²-55=0
t²-t²-2t-1-55=0
2t=-56
t=-28
x²+2x=28
x²+2x-28=0
D=4+112=116
x1=(-2-2√29)/2=-1-√29 U x2=-1+√29
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Answers & Comments
(x²+2x)²-(x²+2x+1)²-55=0
x²+2x=t
t²-(t+1)²-55=0
t²-t²-2t-1-55=0
2t=-56
t=-28
x²+2x=28
x²+2x-28=0
D=4+112=116
x1=(-2-2√29)/2=-1-√29 U x2=-1+√29