This is a senior high Algebra material.

If you're teaching (or tutoring) or probably still in high school, this method is kinda easy to understand. Kinda.

The basic form looks like this :

Let's go to the methods and examples

The plus thingy

√4 + √3 = 2 + √3

The minus thingy

I forgot to put how to come up with 12 = 4 · 3 and 56 = 8 · 7.

The simplest way is to factor the number within the last square root. Then find the ones which if added will produce the first number.

For instance √(8 + 2√15)

We have 8 as the first number and 15 as the last one.

Factors of 15 :

Therefore, we choose the 2

- 1 · 15 = 15
- 3 · 5 = 15
^{nd}one, the 3 · 5 = 15

because 3 + 5 = 8

So we have x = 3 and y = 5

We put all together : √(8 + 2√15) = √3 + √5

Trick #1

Trick #2

If you wanna clarify the simplified forms above, you can go to Wolfram Alpha ➡ then type the complicated-er forms from my examples.

This is fun.

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