Please help me solve this. :)

40

Step-by-step explanation:

   Given problem:

            x² - y²

x+ y = 10

x - y = 4

Solution:

Using the concept of differences of two squares;

      x² - y² = (x + y)(x - y)

So;

      x² - y²  = 10 x 4 = 40

step-by-step explanation:

a: 1/6, j: 1/4

step-by-step explanation: you are welcome