00:03
To solve this, we're going to start by squaring both sides to get rid of this radical, since the radical is by itself.
00:11
And that will leave you with x squared minus 4, what's under the radical.
00:17
Then we're going to square the x minus 1.
00:19
I'm going to do the shortcut for foiling, otherwise you would write it twice and foil.
00:24
So i'm going to square the first term.
00:26
Multiply the two terms together, negative 1, x, and then double it, negative 2x, and square the last term.
00:33
Okay, we want to make a zero on this side, so i'm going to subtract x squared which gets rid of the x squared.
00:42
And then i want to add four to both sides, which gives you positive five...