-2x² +4x solution

Please solve this equation because I have to make a parabola out of this
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1 Answer

y=-2x^2 +4x

y=2x*(-x+2)

y=0 at x=0 & x=-2

dy/dx=-4x+4....=0 at x=-1...slope=0 at x=-1 (horizontal)...thats the top av kerv

parabola is upside down...it go down, down, down
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