Question

Jika ²log x + ³log (x+y) = 5 dan ²log x - ³log (x+y) = 1, maka x + y =...

Answer 1

2logx - 3log(x+y)=1
maka 2logx = 1+3log(x+y)
substitusi ke persamaan pertama

2logx+3log(x+y)=5
1+3log(x+y)+3log(x+y)=5
2 x 3log(x+y)=4
3log(x+y)=4/2
3log(x+y)=2
(x+y)=9

mudah mudahan bisa dimengerti