00:01
Find all the points having an x coordinate of 4 whose distance from the point 2, 1 is 10.
00:08
So let 4, y be such points.
00:18
Now we want to find y so the distance from 2, minus 2, minus 1 to 4, y is equal to 10.
00:30
So the distance formula is d is equal to the square root of x2 minus x1 squared plus y2 minus y1 squared.
00:46
So 10 would be equal to because the distance is 10, 4 minus minus 2 squared plus y minus minus 1 squared.
01:01
So this would be 10 is equal to the square root of y plus 1 squared.
01:11
And this is equal to 36, the square root of 36 plus y squared plus 2y plus 1.
01:19
And this is equal to 10.
01:20
10 is equal to y squared plus 2y plus 37...