Question

If x^2 + 1/x^2 = 7 , find the value
1) x + 1/x
2) x - 1/x
3) 2x^2 - 2/x^2
4) x^3 + 1/x^3.

Answer 1

Answer:

1. +-3
2. +-√5
3. +-6√5
4. +-18

Step-by-step explanation:

By using (a+b)^2 and (a-b)^2 formula we can get the answers of 1 and 2

then third one (a+b)(a+b) formula

fourth one using square find the value of cubes...refer send photo

Answer 2

Answer:

1. 3

2. √5

3. 6√5

4. 18

Step-by-step explanation:

hiiiii mate here is your solution

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..... hope it's helpful. ^_^