Practice problem
Let A={x∈R∣x2>0}A = \{x \in \mathbb{R} \mid x^2 > 0\}A={x∈R∣x2>0}. For which of the following sets BBB does it hold true that A∪B=RA \cup B = \mathbb{R}A∪B=R?
B=∅B = \varnothingB=∅
B={0}B = \{0\}B={0}
B={1,2,−1}B = \{1, 2, -1\}B={1,2,−1}
B={0,1}B = \{0, 1\}B={0,1}
B={x∈R∣x>−2}B = \{x \in \mathbb{R} \mid x > -2\}B={x∈R∣x>−2}
B=RB = \mathbb{R}B=R
Type a concept, like “slope” or “photosynthesis”.