Jawabanmu

2014-02-06T02:50:28+07:00
{4^x + (4 akar 15)x + 15} + { 4^x -( 4 akar 15 )x + 15 } = 62
4^x + 4^x + 15 + 15 = 62
2 . 4^x = 62-15-15
4^x = 32 / 2
4^x = 16
x = 2