need help to solve please see attached

The relationship between a certain real estate company's quarterly profits, P(X], and the amount of money x spent on advertising per quarter is described by the following function where both P(x) and X are measured in thousands of dollars. P[x} = (i)x2 + 8X + 30 (o s x s so] 8 Find the differential of the function. dP= Use the differential to estimate the increase in profits (in dollars] when advertising expenditure each quarter is increased from 526,000 to $28,000. $:l