This week in Pre-Calc, we learned how to add and subtract radical expressions. It’s useful being able to add and subtract radicals together to make the expression look a lot easier and you’re more organized. To add or subtract radicals, you need to simplify as low as possible so that the radicand cannot be a perfect square.
When you simplify your radicals down, you can only add common radicals together. When you’re adding or subtracting radicals, the radicand always stays the same, which is why you need to have a common radicand. Once you’ve collected common radicals you you either add or subtract the co-efficients together depending on the sign.
