00:01
So we're using foil, which remember that means first, outer, inner, and last.
00:08
So we're going to do first.
00:09
First means the first term of each binomial here are going to be multiplied together.
00:14
So we have 5b as one of the first terms, the first term of this binomial.
00:19
8b is the first term of this bitomial.
00:22
So let's do 5b times 8b.
00:25
So 5 times 8 is 40.
00:28
And then we get b squared because remember when you're multiple.
00:31
Two variables that have the same base, in this case b, you add their exponents.
00:38
Next let's do outer.
00:40
So outer would be the outermost terms, which would be this 5b and this 5.
00:46
So we multiply them together and we get 5 to 5, 25, and then the b...