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Add and subtract radicals
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Learn it You can only add or subtract like radicals (the same number under the root), just like $3x + 5x = 8x$. Simplify every radical first.
Example: $\sqrt{12} + \sqrt{27} - \sqrt{75}$
- $\sqrt{12} = 2\sqrt{3}$, $\sqrt{27} = 3\sqrt{3}$, $\sqrt{75} = 5\sqrt{3}$.
- Now they are like radicals: $2 + 3 - 5 = 0$.
- Answer: $0$.
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