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a) Expand the function $f(x) = -4 \left(x + 7\right)\left(x-4\right)\left(x-5\right)$
$f(x)$ =

b) What are the zeros of the function in part (a)? Enter them from smallest to largest.
$($ , $)$ , $($ , $)$ , $($ , $)$

c) What is the $y$ -intercept?
$($ , $)$

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