And let's add the constants.

So per cent, it literally means per 100.

You have one, five, and twenty five.

We're going to do the exponent first.

3 times negative 4y is negative 12y.

let me write this down negative five i, times five i, is negative twenty five times i squared. i squared is negative one, so negative twenty five times negative one is positive twenty five.

Well a lot of people might say, oh, this is easy, Sal.

So let's simplify this expression up here.

Twentyfive seconds!

Well that's negative twenty five i squared.

You have a negative 25 plus a 50, which is 25.

So if I'm borrowing 500, I have to give them back the 500 in two weeks plus 25 for every 100.

So let's figure this out.

Now simplify it more.

BARKER Step right up, folks.

Wanna try, mister?

Let's do one more.

And these two guys over here cancel out, and we're just left with forty nine plus twenty five.

So the denominator we have 25 times x to the third.

Now, they want us to evaluate it when x 2.

Minus 5 plus or minus the square root 25 plus 288 is 313 I believe.

A quarter of a million dollars, sir.

So you have J.T.'s texts, plus his older sister's texts.

Well, that's equal to minus 5 plus or minus the square root of 25.

But let's think about what that is on an APR basis.

You'll get x squared minus 10x.

So 15 to 25 is just a ratio, and we can write it.

And now this one hundred and twenty five is going to shrink by twenty five .

Then you have negative five i time positive five i.

Christmas Day is December 25th.

Christmas is December 25th.

This is the same thing as x squared over 1.

6 minus 4 is 2.

So we are only going to be able to graph this function in the positive x axis.

Get one hundred and eight plus y is equal to four times twenty four.

What's the matter?

Plus25. Better?

For 25 years...

So we just say that this is the same thing is x times x plus five plus five times x plus five. x squared plus five x plus five x plus twenty five.

The square of 5 is 25.

The lake is about 25 meters deep.

So when we simplify it, we get 1 over 25 x.

So 25 extra.

And at first you might say, that's not bad, that's 25 interest.

Adding 25