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方べきの定理の(1)´の公式を使いましょう。
PT²＝PA×PB
(PTは円の接線)
6²＝x・(x+5)
36＝x²+5x
x²＋5x-36＝0
(x+9)(x-4)＝0
x＝-9,4
xは正なので、x＝4
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方べきの定理の(1)´の公式を使いましょう。
PT²＝PA×PB
(PTは円の接線)
6²＝x・(x+5)
36＝x²+5x
x²＋5x-36＝0
(x+9)(x-4)＝0
x＝-9,4
xは正なので、x＝4
Users viewing this question
are also looking at these questions 😉
ありがとうございます！分かりやすかったです！！