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log ( x^2- x) = log x -1
log( x^2- x) = log x - log 10
log ( x^2 - x) = log x/10
Compare
x^2 - x= x/10
10 x^2 - 10 x = x
10 x^2 - 10 x - x = 0
10 x^2 - 11 x = 0
x( 10 x -11) = 0
x= 0, 11/10
x can't.be 0
So its 11/10
2) y= e^( log 20) -1
We know that a^log( base a) x = x
So e^log( base e) 20 = 20
So y= 20 -1= 19
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