Question 1073022
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For the vertex, the problem was solved in 

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The intercepts are (0,0) and (4,0).


The x-intercepts are the roots of this quadratic equation

-x^2 + 4x = 0,


which is factored as x*(4-x) = 0  and immediately gives you the roots x =  and x = 4.


The y-intercept is the value of the function {{{-x^2+4x}}} at x = 0.
This value is 0.
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