Expanding triple brackets

When we have more than two sets of brackets, we can expand them separately - first expand two of the brackets, then expand the result with the remaining bracket.

Example: Expand (2x + 3)(x + 4)(x - 3) using the grid method

First, expand the first two brackets, (2x + 3)(x + 4):

This simplifies to 2x^2 + 11x + 12.

Now, expand this result with the remaining bracket, (x - 3):

This simplifies to 2x^3 + 5x^2 - 21x - 36.

Answer: 2x^3 + 5x^2 - 21x - 36