Sum this expression
It can not be added, because it is same with x, y. Like 3x+4y. So it can not be added.
Sum this expression
simplify this expression
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On this chapter, I learned, the number in the root is same, it can be added and subtracted. But multiplication is possible to multiple that the number in root is not same. Also I learned new words. Like index, radicand, and radical.
