Sum of the roots of the equation x⁴ - 3(2^{x + 3}) + 128 = 0, is:

(1) 0 
(2) 7
(3) 5 
(4) 8

If x, y, z are positive real numbers and a, b, c are rational numbers, then the value of    is :

(1)  –1  
(2)  0 
(3)  1 
(4)  none of these 

If an integer a is less than integer b, then :

1) a lies on the right of b on the number line
2) b lies on the right of a on the number line
3) a lies on the left of b on the number line
4) Both (2) & (3)

The absolute value of an integer x is represented by :

1) [x]
2) {x} 
3) (x)
4) | x |  

If   , then the value of x² + 2x + 3 is:

(1) 3 
(2) 0 
(3) 4 
(d) 1