Question

if a equal to root 5 + 2 by root 5 minus 2 and b equal to root 5 minus 2 by root 5 + 2 show that (3a)² + 4ab - (3b)² equal to 4 + 56/3 root 10

Answer 1

Answer:

(4a)² - 4ba - 3² equal to 8