document.write( "Question 465710: Given the function f(x) = -x²+2x+3
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Algebra.Com's Answer #319173 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi
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document.write( "y = -x^2+2x+3 | y-intercept Pt(0,3)
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document.write( "Using the vertex form of a parabola,  where(h,k) is the vertex
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document.write( "y = -x^2+2x+3    |completing the square
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document.write( "y = -[(x-1)^2 -1]+3
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document.write( "y = -(x-1)^2 +4   Vertex (1,4) a = -1 <0  Parbola opens downward, vertex is max pt
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document.write( "Line of symmetry is x = 1  and when y = 0 (x-1)^2 = 4  x = 3
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