Question

if x^2 + 1/x^2 =7 then x+1/x​

Answer 1

Answer:

(x^2+1/x^2)=7

(X+1/X)-2*x*2/X =7

(X+1/X)-2=7

(X+1/X)=9

Step-by-step explanation:

Answer 2

Step-by-step explanation:

• x²+1/x²=7
• (x+1/x)²=7
• by using identity
• (a+b)²=a²+b²+2ab

1. (x+1/x)²=(x)²+(1/x)²+2×x×1/x=7
2. x²+1/x²+2=7
3. x²+1/x²=7+2
4. x²+1/x²=9
5. (x+1/x)²=9
6. x+1/x=√9
7. x+1/x=√3×3
8. x+1/x=3

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