Question

Jika a = 2√7 dan b = 2-√7 , nilai a²+b²-4ab =.....

Answer 1

(2√7)² + (2-√7)² - 4(2√7)(2-√7) = 95 - 20√7

Answer 2

4.7+4-4√7+7-4(4√7-28)=15.7-4√7-16√7+112=127.7-20√7