The correct answer is (A):
9x-1/2-22x-2 = 4x-32x-3
9x/91/2-22x/4 = 4x-32x/27
9x/3-22x/4 = 4x-9x/27
9x/3-4x/4 = 4x-9x/27
9x/3+9x/27 = 4x+4x/4
9x(10)/24 = 4x(5)/4
Explanation:- 9x/4x = 27/8
(3/2)2x = 27/8 = 33/23 = (3/2)3
2x=3 ⇒ x = 3/2
Alternately, we could’ve substituted the value of x from the options and it would’ve taken much less time.
Let A be the set of 30 students of class XII in a school. Let f : A -> N, N is a set of natural numbers such that function f(x) = Roll Number of student x.
Give reasons to support your answer to (i).
Find the domain of the function \( f(x) = \cos^{-1}(x^2 - 4) \).