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If x=3 √8, find the value of x*2 1/x*2?
Verified Answer
If x=3 √8, find the value of x*2 1/x*2?
x = 3+ √8

x = (3+√8)(3-√8) / (3-√8)

x = (9 -8) / (3-√8)

x = 1/ (3 -√8)

Or we can write 1/x = (3-√8)

Put the value and find out

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

So x^2 + 1/ x^2 = (3 +√8)^2 + (3 -√8)^2

= 9+6√8+8 + 9–6√8+8

= 34. Ans.
This question is part of UPSC exam. View all Class 9 courses
Most Upvoted Answer
If x=3 √8, find the value of x*2 1/x*2?
Given:
x = 3 √8

To find the value of x * 2 1/x * 2, we need to simplify each part of the expression step by step.

Step 1: Simplify x:
x = 3 √8

The square root of 8 can be simplified as follows:
√8 = √(4 * 2) = √4 * √2 = 2 √2

Substituting this value back into x:
x = 3 * 2 √2

Simplifying further:
x = 6 √2

Step 2: Simplify x * 2:
Now, we need to find the value of x * 2. Let's substitute the value of x we found in step 1:
x * 2 = (6 √2) * 2

Multiplying the coefficients (6 * 2):
x * 2 = 12 √2

Step 3: Simplify 1/x * 2:
Next, we need to find the value of 1/x * 2. To do this, we first need to find the reciprocal of x.

The reciprocal of x is:
1/x = 1/(6 √2)

To rationalize the denominator, we multiply both the numerator and denominator by the conjugate of the denominator (6 √2):
1/x = (1/(6 √2)) * (2 √2/2 √2)

Simplifying the numerator:
1/x = 2 √2/(12 * 2)

Simplifying further:
1/x = √2/24

Now, we can multiply the value of 1/x by 2:
1/x * 2 = (√2/24) * 2

Simplifying:
1/x * 2 = √2/12

Final Answer:
So, x * 2 1/x * 2 is equal to 12 √2 * √2/12, which simplifies to 2.
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