kyllow5644
01.06.2021 •
Mathematics
If x is any non-zero rational number then x =
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Ответ:
79
Step-by-step explanation:
Given the expression
x + 1/x = 9
Square both sides
(x + 1/x)^2 = 9^2
x^2 + 2x(1/x)+ (1/x)^2 = 81
x^2 + 2 + 1/x^2 = 81
x^2+1/x^2+2 = 81
x^2+1/x^2 = 81-2
x^2+1/x^2+ = 79
Hence the value of x^2+1/x^2 is 79