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Can someone help me with question 50?

Can someone help me with question 50?-example-1
User Butifarra
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You can factor it as
f(x) = -2x(x -2)
so you know the zeros are at x=0 and x=2.
The axis of symmetry is halfway between, at x=1.
The vertex is then (1, f(1)) = (1, 2).
Can someone help me with question 50?-example-1
User Anoxy
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