Can be written as b plus b plus b plus b, repeated 8 times.

That a plus b a plus b times a minus b is equal to a squared minus b squared.

So we could say (a) plus (b), the whole square's area, is (a) plus (b) squared. ..(a) plus (b)... ...squared, and that's equal to (a) squared plus 2ab plus (b) squared.

B plus A, based on how we define matrix addition, B plus A.

Plus b.

Plus b c i plus b c i.

B times a, plus ba.

2x times b is plus 2bx. a times x is plus ax. a times b is plus ab.

And this is a plus b times a minus b.

So a plus b is equal to what? a plus b is equal to 12.

So that's z plus 2, a plus b, times z minus 2, a minus b.

Because it's plus b a x is one line, y equals plus b a x.

A over A plus B over A

left with a squared plus 2ab plus b squared.

Of a squared plus b squared.

This is equivalent to a plus b times a minus b.

We could right this as x squared plus I can write it as b plus a, or a plus b, x, plus ab.

Times two plus b.

Times 3t plus b.

And then minus b squared times a plus, it becomes a plus b squared over a squared x squared.

So we can write this as a plus b times a minus b.

Which essentially b over a x, plus or minus b over a x.

That way we can feed it a plus b plus c, it'll return a, b and c in a list.

It's b times a, plus d times c, or a times b plus we're just dotting these two guys.

Remember, it's just a times a plus b times a minus a times b, plus a times a, and you'll get this.

And then the last term, we have a plus b minus b.

This will be x times x, which is x squared, plus x times b, which is bx, plus a times x, plus a times b plus ab.

We know that a plus b times a minus b is equal to a squared minus b squared.

So plus b 2. So this is equal to a 2 x 2 plus these two are the same term plus 2abx plus b 2.

So that equals a plus b oh sorry.

It says 3 times, a plus b, t.

And that equals a plus b i. i.

Because that's just a squared plus b squared.

Plus b c minus a d over c squared plus d squared.

Is C plus B defined?

B times x, plus bx.

Plus b over 2a squared.

So plus b 2a squared.

Is there some a and b where a plus b is equal to 10?

And what they ask us is, what is a plus b plus c plus d?

Here we can see that b equals 2 now invalidates a plus b plus c, because we used the value of b there.

So that numerator becomes 4 times x plus 2 times x minus 2, right? a plus b times a minus b.

Well, phi is equal to A over B, which is equal to A plus B over A we know that A plus B over A is the same thing as

It's equal to a squared b squared, plus a squared d squared, plus c squared b squared, plus c squared d squared, minus a squared b squared, minus 2abcd, minus c squared, d squared.

For a plus b plus c, we can simply replace it with x.