If x² - y² = 255 and x + y = 17, then find x - y.

Correct option is B

Given:
​$$x^2 - y^2 = 255$$​​
x + y = 17
Formula Used:
$$x^2 - y^2$$​ = (x - y)(x + y)
Solution:
Substitute the known value into the algebraic identity.
(x - y)(x + y) = 255
(x - y) × 17 = 255
x - y = $$\frac{255}{17}$$​​
x - y = 15
Final Answer
So the correct answer is (b)