00:01
Okay, so if i wanted to determine how much my principal is going to grow after two years, i can just replace t with two to get p times 1 plus r squared.
00:13
Okay, but let's simplify this a little bit.
00:16
I'm going to simplify this 1 plus r to the second power, right? i know that 1 plus r to the second power, that's just the binomial 1 plus r times itself.
00:28
And when i'm multiplying two binomials together, i know i can use foil to simplify this expression.
00:38
So foil, first terms, one times one, is just one.
00:44
My outer terms, one times r, is just one times r.
00:52
My inner terms r times one, that's just the same thing as one r, right? one times r.
00:59
And then my last two terms, r times r.
01:03
When i'm multiplying two terms with the same base, i add their exponent.
01:07
So that's going to be r squared.
01:09
And then i'm going to add all these together...