Let X and Y be the following sets: X = {29,31}
Y = {59,61}

Which of the following is the set X∪Y?
a - {59,61}
b - {29,31}
c - {29,31,59,61}

c - {28,31,59,61} .

Explanation:

The union of two sets is a set containing all elements that are in X or in Y (possibly both).

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11