If b2– 4ac>0 but not a perfect square , then roots of ax2+bx+c=0 are:
a) irrational , equal
b) Imaginary
c) irrational , unequal
d) Rational , equal
Two square roots of unity are……….
a 1, w
b 1,-1
c)1,-w
d)w , -1
Roots of the equations 4x2-4x+1=0
are:
a) real , unequal
b)real,equal
c) imaginary
d) irrational
Solution:4x2-4x+1=0
b2– 4ac =(-4)2– 4(4)(1)
16 – 16=0
