Condensing logarithmic expression in exercise, use the properties of logarithms to rewrite the expression as the logarithm of a single quantity. see example 4.
in(x - 2) - in(x + 2)

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.