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marishaket12
@marishaket12
July 2022
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(x^2+5)(3x^2-1)=2x^4+18x^2=?
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Batyr666
3x^4-x^2+15x^2-5=2x^4+18x^2
3x^4-x^2+15x^2-5-2x^4-18x^2=0
x^4-4x^2-5=0
x^2=a
a^2-4a-5=0
D=16-4*(-5)=sqrt(36)=6
x1=5
x2=(-1)
x^2=5
ответ: x=+-sqrt(5)
1 votes
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Answers & Comments
3x^4-x^2+15x^2-5-2x^4-18x^2=0
x^4-4x^2-5=0
x^2=a
a^2-4a-5=0
D=16-4*(-5)=sqrt(36)=6
x1=5
x2=(-1)
x^2=5
ответ: x=+-sqrt(5)