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Root of a Number

In mathematics, the root of a number (a) is another number (b), which multiply itself for a certain times (x) equals a.

When x=2, it is usually called the square root.
When x=3, it is usually called the cube root.

Root of a Polynomial

In mathematics, a polynomial is an expression numbers and variables that contains addition, subtraction, multiplication, and non-negative integer exponents only. Root of a Polynomial is the values that make the polynomial expression to be zero. For example,

To find the root of:

5x2 - 45

5x2 - 45 = 0
5x2 = 45
x2 = 9
x = ±3