Question

X²-y²=28 , x+y=7 then find value of (x-y)²

Answer 1

Step-by-step explanation:

x² - y² = 28

or, (x + y) (x - y) = 28

or, 7 ×(x - y) = 28

or, (x - y) =28/7

or,( x - y) = 4

Now by taking root squre by both sides the equation becomes,

(x - y)² = 16

Answer 2

sol- x² - y² = 28

or, (x + y) (x - y) = 28

or, 7 x(x - y) = 28

or, (x - y) =28/7

or, ( x - y) = 4