how first equation come
please tell i am practicising
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Answer:
AC² = AF² + CF²
⇒AC² = (AB - BF)² + CF²
⇒AC² = (AB - BF)² + (BC² - BF²)
⇒AC² = AB² - 2AB.BF + BF² + BC² - BF²
⇒AC² = AB² + BC² - 2AB.BF
I hope it helps
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