Question

Numpang tanya log (x^2 - 5) + log 5 =2. Hp???

Answer 1

Log(x^2-5)+log 5 =2
log[5(x^2-5)]=log 10^2
5(x^2-5)=100

kedua ruas bagi 5
x^2 -5 = 20
x^2 = 25
x = 5 atau x=-5

HP = {5,-5}