Question

Berapakah nilai a yg memenuhu :

Answer 1

(log a) = x

2 log ^2 a + log a= 6
2(log a)^2 + log a - 6 =0
2 x^2 + x - 6 =0
(2x+3)(x-2) =0

x = -3/2     atau                 x=2
log a = -3/2                      log a =2
10^-3/2=1/ akar 1000      10 ^2=100
1/10akar10= akar10/100