00:01
Okay, here we have two numbers.
00:02
Let's call them x and y.
00:04
So their product, x times y, is 10.
00:10
And difference of their squares.
00:12
So x squared minus y squared, which is 21.
00:18
So first step then translate from the words into two equations.
00:23
Now, from here, i can see that y is 10 divided by x, which means here i can.
00:32
Can replace the y by 10 divided by x and get that result, which means we have x squared minus 100 over x squared equals 21.
00:51
Now times both sides by x squared and get x to the fourth minus 100 is 21 x squared.
01:02
We arrange that x to the fourth minus 21 x squared...