Question
समीकरण ${3^{2x}} - {10.3^x} + 9=0$ के मूल हैं
माना $a = {3^x}$, तो यह निम्न समीकरण में बदल जाता है।
${a^2} - 10a + 9 = 0\,\,\, \Rightarrow (a - 9)(a - 1) = 0\,\, \Rightarrow a = 9,1$
अब $a = {3^x}\,\, \Rightarrow 9 = {3^x}\,\, \Rightarrow {3^2} = {3^x}\,\, \Rightarrow x = 2$
एवं $1 = {3^x}$$ \Rightarrow \,\,{3^0} = {3^x}\,\, \Rightarrow x = 0$. अत: मूल $0, 2$ हैं।
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