Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$S= { \left(x-1 \right) }^{ 2 } + { \left(x+1 \right) }^{ 2. } ,x= \frac{ 1 }{ \sqrt{ 5 } }$$

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