Equal

When something is equal to something else, then they have the same value. For instance, if , then belongs to the set of numbers {4}. You are also able to use this to prove other statements.

Question: Given that , prove that .

Solution: We can first square our original equation to get . We can add to that, as we know that still equals . So, . We can also subtract both the left and the right side of the equation by , giving us . This proves what we wanted to prove.

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