Frequent Questions about our Solver

The problem

Click to see the original problem

why does x squared minus 9 equal x-3 and x+3

Answer provided by our tutors

Difference of two squares rule is applied. The rule says:

A^2−B^2=(A−B)(A+B)

In your case A = x and B = 3.

You can obtain an explanation for any step by clicking on it. Please note that you cannot click on the very first expression, which is the original problem.

← Previous Problem Next Problem →