Question

3) Find x, if 2log x = 4​

Answer 1

The value of x is 9

Step-by-step explanation:

> log x^2 = log 3^4> x^2 = 81>

x = 9

Answer 2

Answer:

ANSWER

Consider the given equation.

2log(x2y)=3+log x−log y

log (x2y)2=3+log yx

log (x4y2)−log yx=3

log (x4y2×xy)=3

log (xy)3=3

(xy)3=103...........(logab=x⇒b=ax)

xy=10⇒y=x10 ........ (1)

And (x−y)=3........(2)

substitute equation (1) in (2) 

x−x10=3

xx2−10=3

x2−3x−10=0

x2−