Next problem.

When we play a Beethoven Quartet, that music has such a power to it to transform its surroundings that when we played it, say, at a club in the Lower East Side, it actually you can feel like the light in the room changes when that music starts.

6 plus 33 would be 39 and then you have another 10, so it's 49.

Now, can we simplify this?

So let's just do it any which way.

So 7 27's.

Actually, let's just do what we did up here so you don't have to remember that difference of squares pattern and all that.)

And there's something interesting here.

Me? I'm 49 years old.

Is equal to a diference of squares.

Im I allowed to say yatee! can I say san francisco? sure but I can't say the f... yee! can I say the baltimore hhhhcks! can I say the san francisco fifty minus one (thumbs up) love it can we say the baltimore black birds? absolutely! all you want so what do we say instead of super...

Five squared is 25.

7 times 7 is 49, so it goes into it seven times.

Richard Kimble, now wearing the name Larry Talman.

Why the timer? Because the moment we start those machines is the moment we'll end up...

Seventy seven times seventy seven.

Put a four there.

To do that, we divide 36 into 49.

We write the six down here, put the five up there.

Well, that's fifty four.

It does go into 51.

So it goes 7 times .

So what's 7 12 squared?

Which is, let's see, 9 times 8 is 72.

Back then actually my first expedition was when I was 17 years old.

And you can do that manually, if you like you.

You'd say 36 into 49.

If I did it to the left hand side I have to do it to the right hand side.

Seven times six, forty two.

So this is equal to 49 25.

But we have to add this five up here, so you add this five.

7 times 7 is 49.

Now, this thing that we have here is exactly that pattern.

You could try it out.

You could've had me for 49.95.

Now let's do this next one.

49 is a perfect square.

So let's write it as a proper fraction.

Seven times seven is forty nine.

So the answer is A.

Put the four up here.

These guys down here cancel out.

49.

So f(5) is going to be equal to 49 minus ... instead of writing x 2, I would write 5 2.

And that is going to be equal to let's get a common denominator, 144.