Question

If x-y =7 and xy = 9 the the value of x square + y square

Answer 1

Answer:

67

Step-by-step explanation:

(x - y) = 49

x² - 2xy + y² = 49

x² + y² = 49 + 2xy = 49 + 18 = 67.

Answer 2

Answer:

67.

Step-by-step explanation:

1. x - y = 7

2. xy = 9

3. x^2 + y^2 = ?

4. (x - y) = 49

x^2 -2xy +y^2 = 49

x^2 +y^2 = 49 + 18

x^2 + y^2 = 67.