The function f(x) = kx² - 12x + 18 has a maximum value when x = -2. Find the value of k and the maximum value of f(x). - The Random Trivia کوئز

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The function f(x) = kx² - 12x + 18 has a maximum value when x = -2. Find the value of k and the maximum value of f(x).

Choose the right answer:

k = -3, maximum value of f(x)= 30

k = 10, maximum value of f(x) = 50

k = -1, maximum value of f(x)= 20

k = 5, maximum value of f(x) = 40

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