Sktech The Parabola, And Label The Focus, Vertex,...

Anonymous

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Sktech the parabola, and label the focus, vertex, anddirectrix. y= 4x^2+8x+5

 

Answer No.1

Anonymous

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Y = 4*(x^2 + 2x) + 5 y = 4(x^2 + 2x + 1) + 5 -4 y - 1 = 4*(x^2+2x+1) (1/4)*(y - 1) = (x+1)^2 (1/16)*4*(y-1) = (x+1)^2 vertex at (-1,1) focus at (-1, 17/16) directrix at y = 15/16 (=1-1/16) you can see the definitions here: http://en.wikipedia.org/wiki/Parabola#Analytic_geometry_equations

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