Question 5 Find the value of b or c the given functions the given minimum value or maximum value: a) f(x) = 2x2 + 12x+ c; minimum value -9. b) f(x) = -x + bx+ 4; maximum value 8. c) f(x) - 3x + 12x+ c; minimum value -4. d) f(x) = -x² - bx-2; maximum value 7.

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