When solving equations remember that whatever operations are performed on the LHS of the equation must be performed on its RHS to keep the equation in balance.
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Why? - Mainly to help in solving equations.
if you are good at math, you would know. I'm not being mean, but sometimes it takes a little help from an adult.
You plug the number back into the original equation. If you have a specific example, that would help.
There are several good websites to find help with radical equations. You tube has several good videos on radical equations that are free of charge.
This means that, for example: 15 - 5 = 15 + (-5) 15 - (-5) = 15 + 5 Knowing this relationship can both help you do the actual calculations, and assist you in solving equations.