ii Find the union of the sets 11 3U12 4 Choose the correct a

Find the union of the sets. 11, 3U12, 4) Choose the correct answer below. O A. {1, 3U12, 4t -12, 4) O D. {1, 3)UK2, 4) (1, 2, 3, 4)

1. {1,3}U{2,4}

combining of all the distinct elements of the two sets is the union of the two sets.

{AUB}={x|xA or xB}

For ex : A={red,blue,green} and B ={yellow , green}

Then {A}U{B} = { red ,blue ,green,yellow}

Therefore, the answer of this question is (D) : {1,3}U{2,4}={1,2,3,4}.

2. {x|x^2=81}

x^2=81;

x=-9,+9.

So, this resulting set represents the value of x and is equal to {-9,+9}.