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YanaWey
@YanaWey
August 2022
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Решить уравнение : х+2=корень из 8+х
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Хелем
X+2 = √(8+x)
(x+2)^2 = (√(8+x))^2
x^2 + 4x+4 = 8+x
x^2 +4x+4-8-x= 0
x^2 +3x -4=0
D= 9-4*(-4) = 9 + 16 = 25
x1 = (-3-5)/2 = -8/2 =
-4
х2 = (-3+5)/2 = 2/2 =
1
7 votes
Thanks 7
YanaWey
Спасибо, у меня тоже так же получилось! :3
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Answers & Comments
(x+2)^2 = (√(8+x))^2
x^2 + 4x+4 = 8+x
x^2 +4x+4-8-x= 0
x^2 +3x -4=0
D= 9-4*(-4) = 9 + 16 = 25
x1 = (-3-5)/2 = -8/2 = -4
х2 = (-3+5)/2 = 2/2 = 1