y = -x^2 + 4x + 5
2006-11-20 02:09:42 · 4 answers · asked by wickedwickbrian 1 in Education & Reference ➔ Homework Help
You have the axis of symmetry which is parallel to y axis and cuts the parabola through the maximum
You find the axis of the maximum in zeroing the derivative
dy/dx = -2x +4 for dy/dx = 0 -2x+4 =0 x=2
The axis of symmetry is the parallel to ordinate axis through x=2
2006-11-20 02:21:16 · answer #1 · answered by maussy 7 · 0⤊ 0⤋
The axis of symmetry of a parabola that opens up or down is a vertical line through the vertex. For example, if (h,k) is the vertex then x = h is the axis of symmetry. So, you need to find the vertex of the parabola in your problem. I haven't figured it out, but let's pretend it comes out to (-2, 3). Then x = -2 is the axis of symmetry.
So, go for the vertex and your on your way.
2006-11-20 03:38:54 · answer #2 · answered by LARRY R 4 · 0⤊ 0⤋
x=5?
2006-11-20 02:19:13 · answer #3 · answered by ustaadji 2 · 0⤊ 0⤋
i think its x=0, y=5.
2006-11-20 02:22:29 · answer #4 · answered by dream_girl1414 2 · 0⤊ 0⤋