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aensepbaeva1
@aensepbaeva1
July 2022
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решите пожалуйста ребята
√х-5 + √10 - х=3
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nKrynka
Решение
√(х - 5) + √(10 - х) = 3
(√(х - 5) )^2 = (3 - √(10 - х))^2
x - 5 = 9 - 6√(10 - х) + 10 - x
6√(10 - х) = 24 - 2x / 2
(3√(10 - х))^2 =(8 -x )^2
9*(10 - x) = 64 - 16x + x^2
90 - 9x = 64 - 16x + x^2
x^2 - 7x - 26 = 0
D = 49 + 4*1*26 = 153
2 votes
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Answers & Comments
√(х - 5) + √(10 - х) = 3
(√(х - 5) )^2 = (3 - √(10 - х))^2
x - 5 = 9 - 6√(10 - х) + 10 - x
6√(10 - х) = 24 - 2x / 2
(3√(10 - х))^2 =(8 -x )^2
9*(10 - x) = 64 - 16x + x^2
90 - 9x = 64 - 16x + x^2
x^2 - 7x - 26 = 0
D = 49 + 4*1*26 = 153