Question

Is this an example of null set?

D={x : x Element of N and x^2+x+1=0}​

Answer 1

Step-by-step explanation:

Which of the following is the empty set ?

A. {x : x is a real number and x2

x2 – 1 = 0}

B. {x : x is a real number and x2

x2 + 1 = 0}

C. {x : x is a real number and x2

x2– 9 = 0}

D. {x : x is a real number and x2

x2 = x + 2}