rue61
07.09.2020 •
Mathematics
The Income Summary account is closed to which of the following accounts? Question options: Retained Earnings Withdrawals Expenses Dividends
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Ответ:
Note that
f(x+h) - f(x) = (x+h)³ - 4(x+h)² + 2 - (x³ - 4x² + 2)
= x³ + 3x²h + 3xh² + h³ - 4(x² + 2xh + h²) + 2 - x³ + 4x² - 2
= 3x²h + 3xh² + h³ - 8xh - 4h²
Therefore
[f(x+h) - f(x)]/h = 3x² +3xh + h² - 8x - 4h
That is
f'(x) = 3x² - 8x
f'(3) = 3(3²) - 8(3) = 3
3