Question

(x'-2y'/√5)² - (2x'+y'/√5)²=-3x'²+3y'²-8x'y' prove BSc

Answer 1

Answer:

20

Step-by-step explanation:

√5 ¤ √5 = (√5 + √5)² - (√5 - √5)²

= (2√5)² - (0)²

= (2√5)(2√5)

= 4√25

= 20