Question 948124
Express the quadratic function in standard form
f(x) = -x^2+4x 
must find the vertex, x-intercept and y-intercept 
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y=-x^2+4x
complete the square:
y=-(x^2-4x+4)+4
y=-(x-2)^2+4
This is an equation of a parabola that opens down:
vertex: (2,4)
y-intercept: (0,0)
x-intercepts: 0, 4