00:01
Okay, so here we have, well, the square root, we have 5u plus 13 under the square root, and this is equal to 4.
00:10
So to solve this, we want to kind of undo the square root.
00:13
And to do that, we can just go ahead and square both sides.
00:16
Because the square, if we square, the square root of something squared is just whatever's under the square root.
00:23
So if we square both sides, well, the square root of 5u plus 13 squared is just equal to 5u plus 13.
00:33
That's going to be equal to 4 squared, which is 4 times 4.
00:36
That's going to be 16.
00:38
And then we can go ahead and subtract 13 from both sides...