Question

Check whether the following sets is empty or non-empty. Also write the

cardinality of each set.C = {x : x ∈ Z and 4x
^2− 1 = 0}​

Answer 1

Answer:

${4x}^{2} - 1 = 0 \\ (2x - 1)(2x + 1) = 0 \\ x = \frac{1}{2} \: or \: x = - \frac{1}{2} \\ so \: set \: c \: is \: empty \: set$

Answer 2

Answer:

this

is

correct

...........