TestMagic Forums - View Single Post - A Couple of Hard Questions from a CAT Exam

dissa · 2009 May 26th, 03:15 AM

3.answer (E)

f(x) =-3x

f(a)= -3a--(1)
f(b)= -3b---(2)

f(a+b)= -3 (a+b)

(1) + (2)

f(a) + f (b) = -3a + (-3b) = -3 (a+b)

f (a+b) =f (a) + f (b)

2. answer (E)

(sqrt x^2)/ x = (+/- x)/x

2009 May 26th, 03:15 AM	#2 (permalink)
dissa Within my grasp! Join Date: Apr 2009 Posts: 224	3.answer (E) f(x) =-3x f(a)= -3a--(1) f(b)= -3b---(2) f(a+b)= -3 (a+b) (1) + (2) f(a) + f (b) = -3a + (-3b) = -3 (a+b) f (a+b) =f (a) + f (b) 2. answer (E) (sqrt x^2)/ x = (+/- x)/x