determine whether the set is ﬁnite or inﬁnite. If the set is ﬁnite, ﬁnd its size.
-$$\left\{ x \mid x \in \mathbf { N } \text { and } 9 x ^ { 2 } - 1 = 0 \right\}$$

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The Answer of determine whether the set is ﬁnite or inﬁnite. If the set is ﬁnite, ﬁnd its size.
-$$\left\{ x \mid x \in \mathbf { N } \text { and } 9 x ^ { 2 } - 1 = 0 \right\}$$

Determine Whether the Set Is ﬁNite or Inﬁnite {x∣x∈N and 9x2−1=0}\left\{ x \mid x \in \mathbf { N } \text { and } 9 x ^ { 2 } - 1 = 0 \right\}{x∣x∈N and 9x2−1=0}

Determine Whether the Set Is ﬁNite or Inﬁnite $\left\{ x \mid x \in \mathbf { N } \text { and } 9 x ^ { 2 } - 1 = 0 \right\}$