If a and b are real numbers suchthat (2 + )4 = a + b, where then a + b is equal to :
33
24
9
57
The product of the roots of the equation 9x2 – 18|x| + 5 = 0 is
A.
If the four complex numbers represent the vertices of a square of side 4 units in the Argand plane, then |z| is equal to :
4
2