Quiz Discussion

If $x = 3 + \sqrt 8 ,$ then ${x^2} + \frac{1}{{{x^2}}}$ is equal to = ?

• 1] 30
• 2] 34
• 3] 36
• 4] 38

The smallest number to be added to 680621 to make the sum a perfect square is = ?

• 1] 4
• 2] 5
• 3] 6
• 4] 8

$\sqrt {110.25} \times \sqrt {0.01} \div$    $\sqrt {0.0025}$  - $\sqrt {420.25}$  equals ?

• 1] 0.50
• 2] 0.64
• 3] 0.73
• 4] 0.75

R is a positive number. It is multiplied by 8 and then squared. The square is now divided by 4 and the square root is taken. The result of the square root is Q. What is the value of Q ?

• 1] 3R
• 2] 4R
• 3] 7R
• 4] 9R

$\sqrt ? \times \sqrt {484} = 1034$

• 1] 2025
• 2] 2209
• 3] 2304
• 4] 2401
• 5] None of these