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\( U(K, L)=\sqrt{K}+L \)
\( K+20 L=50 \)
\( U(K, L, \lambda)=\sqrt{K}+L+\lambda(K+20 L-50) \)
\( \frac{d U(K, L, \lambda)}{d K}=\frac{1}{2} \sqrt{K}+\lambda \)
\( \frac{d U(K, L, \lambda)}{d L}=1+20 \lambda \)
\( \frac{d U(K, L, \lambda)}{d \lambda}=K+20 L-50 \)
1. \( ) \frac{1}{2 \sqrt{K}}+\lambda=0 \)
2. \( ) 1+20 \lambda=0 \rightarrow \lambda=-\frac{1}{20} \in 1 . \)
\( \frac{1}{2 \sqrt{K}}-\frac{1}{20}=0 \)
\( \frac{1}{\sqrt{K}}=\frac{1}{10} \)
\( \sqrt{K}=10 \)
\( K=100 \)
\( 100+20 L-50=0 \)
\( L=-\frac{5}{2} \)
\( U=10-2,5=7,5 \)
\( \mathrm{mfG} \)
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