41. If5a + =5, the value of 90
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41. If5a + =5, the value of 90

11th - 12th Class
Maths
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121
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41. (2) ( 5 a+frac{1}{3 a}=5 ) On multiplying by ( frac{3}{5} ) ( 3 a+frac{1}{5 a}=5 times frac{3}{5}=3 ) On squaring, ( 9 a^{2}+frac{1}{25 a^{2}}+2 times 3 a times frac{1}{5 a}=9 ) ( Rightarrow 9 a^{2}+frac{1}{25 a^{2}}=9-frac{6}{5}= ) ( frac{45-6}{5}=frac{39}{5} )
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