Question

lf x= 9-4√5 find xsquare + 1/xsquare​

Answer 1

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Answer 2

Answer:

x=9-4 root 5

then find x^2 + 1/x^2

Explanation:

(9-4 root 5)^2 + 1/(9-4 root 5)^2

(9)^2 + (-4 root 5)^2 -2×9×4 root 5 + 1/9^2 + (-4 root 5)^2 -2×9×4 root 5

49+80-72 root 5 +1/49+80-72 root 5

129-72 root 5 + 1/129-72 root 5

[129-72 root 5(129-72 root 5) +1]/129-72 root 5

(5280.4+1)/129-72 root 5

5281.4/129-72 root 5

120.055 it is the answer

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