How to simplify the root number into the simplest root number, such as root number 20 and root number 50, is there a formula? Junior high school math is not good, so I ask here.

Generally speaking, simplifying the quadratic radical means making the quadratic radical:

The (1) radical sign does not contain factors or factors that can drive to the limit;

(2) The root sign does not contain the denominator;

(3) The denominator does not contain the root sign.

The quadratic radical obtained by this simplification is called the simplest quadratic radical.

Example: (1) radical number 20= radical number (4×5)= radical number (2? ) × root number 5=2 root number 5;

(2) Root number 50= Root number (25×2)= Root number (5? ) × root number 2=5 root number 2.