Question

Sabendo que x2 + y2=74 e que xy=35, calcule valor de (x - y2)2

Answer 1

To solve this problem you must apply the proccedure shown below:

1. You have the following information given in the problem above:

- x²+y²=74
xy=35

2. Therefore, you have that (x-y)² is:

=(x-y)²
=x²-2xy+y²
=(x²+y²)-2xy

3. When you substitute the values given in the problem, you obtain:

=74-2(35)
=74-70
=4

4. Therefore, as you can see, the correct answer is: 4