Subject
Quantitative Aptitude
Topic
Solution
If x = 3 + 2√2, then the value of (√x - 1/√x) is:
If x = 3 + 2√2, then the value of (√x - 1/√x) is:
ক)
1খ)
2গ)
22ঘ)
33Explanation
(√x -1/√x)2 = x +(1/x) – 2 = (3 + 2√2) +1/(3 + 2√2)- 2 = (3 + 2√2) +1/(3 + 2√2) x (3 - 2√2)/ (3 - 2√2) – 2 = (3 + 2√2) + (3 - 2√2) – 2 = 4. Therefore, (√x - 1/√x) = 2.Related questions
If A+B+C=10, A+B = 7 and A-B =5, What is the value of C?If x=1 - q and y = 2q+1 , then for what value of q. x is equal to y ?Which one of the following is a solution to the equation x4– 2x2= -1?If 3√x = 2√3, What is the value of x?50 g of an alloy of gold and silver contains 80% gold(by weight). The quantity of gold, that is to be mixedup with this alloy, so that it may contain 95% gold is?If x = y + 4 and x = 20-y, then x2-y2=If (4-x)/(2+x) = x, what is the value of x2+ 3x -4?If n is a number such that (-8)2n = 28+2n, then n=