Algebra trick for multiplying polynomials

[matthewh.]

This is nice, but it's over-complicating it. There's a much simpler way to do it.
Simply take your first polynomial and write it vertically (to the left, and underneath) your second polynomial. From there, draw a matrix (boxes) between the two (so if your multiplying a trinomial by a trinomial, you'll have nine boxes. For a binomial times a binomial, you'll have four boxes. And for a binomial times a trinomial, you'll have six boxes).
Then simply multiply the values on the left side by the values on the top, and write the answers to each in the intersecting boxes under/beside them. After that, you can pick your like terms very simply, especially since your exponents will line up diagonally across your matrix (from top right to bottom left).
After that, you can check it the same way shown in the video(s), which I especially like. But don't over-complicate this.

[dineshmathsclasses]

Nice explanation of a really time saving method.Thank you so much for your effort Sir.

[Jayceh]

So you multiply the coefficient of the terms that would make up that specific degree then add them altogether and that would make up the term?

[monsterjazzlicks]

@ 7:30 - Could you please substitute 'x' for '10' (like you do in all prior videos)? Thanks

[monsterjazzlicks]

In the previous videos, the method of calculation was called RAINBOW. Does this method also have a specific name please?

[brittandkaj]

don't you have to write an x for multiplied by between the two lines?

[monsterjazzlicks]

This is very HARD! It really is a hell of a lot to try and memorize the order of the solving pattern here ;-(

[monsterjazzlicks]

If 'X = 10' in the first question, then is the answer: '9, 011, 882' please? You did not substitute 'X' for '10' here!? Cheers.

[amiceamice]

first commet bot counting the first person wooh i love you woooh lol ;)

[monsterjazzlicks]

What happens please when you get to FIVE PART polynomials?! lol

[monsterjazzlicks]

If 'X = 10' in the second questions, then is the answer: '21, 339, 360', please? You did not substitute 'X' for '10' here!? Cheers.