If the negative power of X + X is 3, what is the square of X + the negative power of X?

Because x + x ^ - 1 = 3, the squares on both sides get x ^ 2 + 2 + x ^ - 2 = 9 (^ means square), so x ^ 2 + x ^ - 2 = 7

RELATED INFORMATIONS

1. It is known that the equation (K's Square-1) x's Square-6 (3K-1) x + 72 = 0 has two unequal real roots, so we can find the value of K
2. 3 / 4 x △ 2 = 3 solution equation
3. How to put the six numbers 123456 into a triangle and ask the sum of the three numbers on each side to be equal?
4. When k is a real number, the equation x ^ 2 + 2 (k-1) x + 3K ^ 2-11 = 0 has two unequal real roots?
5. How to solve the equation problem: X-1 / 2 + X + 1 / 3x = 2?
6. How many ways can I fill six numbers 123456 in the circle to make the sum of three numbers on each line equal?
7. Given that a, B and C are all real numbers, a ^ 2 + B ^ 2 + C ^ 2 = 1, what are the maximum and minimum values of AB + BC + AC?
8. The equation x / (X-2) + (X-2) / x + (2x + a) / X (X-2) = 0 has only one real root
9. The process of solving equation 3x + 1 = - 2
10. How to solve the equation 7x + 65 = 8x?
11. How many five digit numbers can be formed with 0, l, 2, 3, 4, 5? Five odd? Five even? The answer is 600 3240 3240
12. X-4 / 3x = 8 solution equation
13. The solution of the equation 2x + 3Y = 9 can be obtained according to the following conditions: (1) the value of X and the value of Y are opposite to each other; (2) the value of X is three times of Y
14. Given that the quadratic power of a plus a times b equals minus ten, and the quadratic power of B plus a times b equals 14, find the value of a times B
15. The five numbers 03568 make up the three digit number without repetition. How many even numbers are made by permutation and combination
16. Equations 3x + 4Y = 7 ① 6x-2y = 11 ②
17. When x=____ The values of equations 6-2x + 2 and 4-x + 11 + X are opposite to each other
18. The arithmetic square roots of 0.4 are () a, 0.2 B, ± 0.2 C, D, ±
19. How many 4-digit numbers are there in 123456
20. Solve the equation (3x + 5) (3x-5) + 6x = - 26 2Y ^ 2 + 4y-3 = (2Y + what) ^ 2-5