设集合A={x^22x-1,-4},B={x-5,1-x,9},若AnB={9},求AUB.

问题描述:

设集合A={x^22x-1,-4},B={x-5,1-x,9},若AnB={9},求AUB.

x=-3
AUB={9,-7,-4,-8,4}