Question

Jika x1 dan x2 memenuhi persamaan 2^x + 2^-x =17/4 maka x1+x2 adalah

Answer 1

Verified answer

EksPonenSiaL

Misal :
2^x = a

a + 1/a = 17/4
a² - 17/4 a + 1 = 0
a1 . a2 = 1
2^x1 . 2^x2 = 1
2^(x1 + x2) = 1
2^(x1 + x2) = 2^0
x1 + x2 = 0