Solve the equation f (x) = 0 for each of the following quadratic functions: (a) f (x)

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Solve the equation f (x) = 0 for each of the following quadratic functions:
(a) f (x) = x2 − 16

(b) f (x) = x(100 − x) 

(c) f (x) = −x2 + 22x − 85
(d) f (x) = x2 − 18x + 81 

(e) f (x) = 2x2 + 4x + 3

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