6
5
4
3
Correct answer is D
(√x+1)∗(√x−1)=4⟹√x+1√x−1+√x−1√x+1=4
(√x+1)(√x+1)+(√x−1)(√x−1)(√x−1)(√x+1)
= x+2√x+1+x−2√x+1x−1⟹2x+2x−1=4
2x+2=4x−4∴
x = 3
Find the unit vector in the direction of -2i + 5j....
Find the locus of points which is equidistant from P(4, 5) and Q(-6, -1). ...
A line passes through the origin and the point (1\frac{1}{4}, 2\frac{1}{2}). Find the y-coordina...
Given that \overrightarrow{AB} = 5i + 3j and \overrightarrow{AC} = 2i + 5j, find \(\overrigh...
A rectangle has a perimeter of 24m. If its area is to be maximum, find its dimension. ...
If →PQ = -2i + 5j and →RQ = -i - 7j, find →PR ...
Given that f '(x) = 3x^{2} - 6x + 1 and f(3) = 5, find f(x)....
The table shows the mark obtained by students in a test. Marks 1 2 3 4 5 Frequency ...
A binary operation ,*, is defined on the set R, of real numbers by a * b = a^{2} + b + ab. Find ...