Mathematics
Senior High
Resolved
解説お願いします。
mを消去以降がわかりません。
10m の値が変化するとき, 放物線y=x2+4mx+3mの頂点Pの軌跡を求めよ。
P(X, Y)とおく
y=ix²+4mx+4m²)-4m²+3m
=
(x+2m)4m²+3m
頂点Pの軌跡は中心(-2m,-4m²+3m)の円
x=-2m
Y=-4m²+3m
mを消去
-zm
t
-4m²+3m
4m²~5m
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