Question

If x+y= 13 and xy = -14 find (x-y)
plz help me..​

Answer 1

Answer:

x + y = 13

xy = -14

• now

(x + y)² = 13² = 169

x² + 2xy + y² = 169

(x² + y²) + 2xy = 169

(x² + y²) - 28 = 169

(x² + y²) = 169 + 28

(x² + y²) = 197

• here

(x - y)² = (x + y)² - 2xy

= 197 - (-28)

= 197 + 28

= 225

(x - y)² = 225

x -y = 15 is Answer