00:01
To rationalize the denominator, we're going to multiply by the conjugate.
00:03
So the conjugate would be 5 plus the square of 7 in the numerator and in the denominator.
00:09
Now, in the numerator, we're just going to foil.
00:12
So 2 times 5 is 10, 2 times square to 7 is 2 square to 7, all by 5 square to 3, and then last would be the square to 21.
00:22
In the denominator, though, 5 times 5 is 25, then we would have plus 5 square to 7, minus 5 square to 7 and then minus the square to 49.
00:32
So nothing in the numerator will combine, but let me fix this right here.
00:37
The square to 2 should be square to 7...