Does the law of grouping apply to the multiplication ?

Yes

Step-by-step explanation:

Law of grouping states when more than two numbers are added, they can be grouped in any way without changing the sum, also known as the associative property; applies to multiplication and well.

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.