Question

please solve using identities.
(a²+b²) = a² + 2ab + b²
(a²-b²) = a² - 2ab + b²
(a+b) (a-b) = a² - b²​

Answer 1

Answer:

(x-y)² = x² + y² - 2xy

(x-y)² = 80 - 2x12

(x-y)² = 80 - 24

(x-y)² = 56