42.) 5 If a = - -- then the simplif...
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42.) 5 If a = - -- then the simplified value of a is: 5 5+- 15-5 (c) 215-5 (D) 3/5 +5

JEE/Engineering Exams
Maths
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( a=5 ) ( begin{aligned} a &=frac{5}{5+a} Rightarrow & a^{2}+5 a=5 &=2 a^{2}+5 a-5=0 &=frac{-5 pm sqrt{45}=-frac{5 pm 3 sqrt{5}}{2}}{2} end{aligned} ) ( therefore a=frac{355-5}{2} )
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