if `xepsilon R` then the value of `-7x^2+8x-9` (i) zero (ii) positive (iii) negative (iv) not determined

if -(1)/(2)

If x in R then the value of -7x^2 +9x-9 is

The value of 1+i+i^(2)+... + i^(n) is (i) positive (ii) negative (iii) 0 (iv) cannot be determined

IF 4lt x lt 8 then the value of - 7x^2+8x -9 is

If the velocity of an object is increasing and changing at a uniform rate then the acceleration of the object is "(i) Positive (ii) Zero" " (iii) Negative (iv) Not defined"

If the velocity of an object is increasing and changing at a uniform rate then the acceleration of the object is "(i) Positive (ii) Zero" " (iii) Negative (iv) Not defined"

the expression -7x ^2 + 8x -9 is positive if x lies in

The position-time (x-t) graph of an object in uniform motion is shown below, the velocity of object is (i) Positive (ii) Negative (iii) Zero (iv) None of these

The position-time (x-t) graph of an object in uniform motion is shown below, the velocity of object is (i) Positive (ii) Negative (iii) Zero (iv) None of these

If the coefficient of (r+1) th term and (r+3) th term in the expansion of (1+x)^(20) are equal, then the value of r is (i) 8 (ii) 9 (iii) 16 (iv) None of these