Whenever a and b commute.

Note how Lake above had to write it explicitly that ab = ba

its known as the

difference of squares

Whenever a and b commute.

Note how Lake above had to write it explicitly that ab = ba

But ab = ba, so the terms in the middle are the same with opposite signs. They cancel leaving a b.

But ab = ba, so the terms in the middle are the same with opposite signs. They cancel leaving a b.

Source(s): write your questions more clearly

Whenever a and b commute.

Note how Lake above had to write it explicitly that ab = ba

If so, then the answer is always. You can find this by distributing.

its known as the

difference of squares

need to recognize the parts

they pop up EVERYWHERE!!!

Source(s): write your questions more clearly

Source(s): write your questions more clearly

This post is last updated on hrtanswers.com at Date : 1st of September – 2022