Which is NOT an equivalent form?
logb(xy)=logb(x)+logb(y)\log_b(xy) = \log_b(x) + \log_b(y)logb(xy)=logb(x)+logb(y)
logb(xy)=logb(x)−logb(y)\log_b(\frac{x}{y}) = \log_b(x) - \log_b(y)logb(yx)=logb(x)−logb(y)
logb(xn)=nlogb(x)\log_b(x^n) = n\log_b(x)logb(xn)=nlogb(x)
logb(x)=logx(b)\log_b(x) = \log_x(b)logb(x)=logx(b)